BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC
N-30D, 1998-02-27
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- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                          ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- -------------------------------------------------------------------------------


                                                                January 31, 1998

Dear Trust Shareholder,

      U.S fixed income  investors  have been  rewarded  with solid total returns
over the past twelve  months  ended  December  31, 1997,  as low  inflation  and
moderate economic growth drove Treasury yields lower.

      The economy has shown some signs of slowing,  which BlackRock  expects may
persist as  recessions in the emerging  Asian  economies and Japan will moderate
U.S.  growth.  We do not see immediate signs of inflationary  pressure nor do we
anticipate an imminent  change in monetary  policy by the Federal  Reserve.  Our
longer-term  outlook  for the  bond  market  remains  optimistic,  based  on the
fundamentally  favorable  backdrop of slower economic growth,  low inflation and
declining Treasury borrowing.

      There are exciting developments  occurring at BlackRock that we would like
to share with you. As you may know,  BlackRock was acquired by PNC Bank, N.A. in
1995. In early 1998 the five investment  management  firms that comprise the PNC
Asset Management Group were consolidated under the BlackRock umbrella. This will
result in BlackRock Inc.  becoming a $100 billion money  management firm ranking
it among the 25  largest  in the  country.  We look  forward to using our global
investment management expertise to present exciting investment  opportunities to
closed-end fund shareholders in the future.

      This report contains detailed market and portfolio strategy  commentary by
your Trust's  managers in addition to the Trust's audited  financial  statements
and a detailed portfolio listing. We thank you for your continued  investment in
the Trust and wish you a successful new year.

Sincerely,


/s/Laurence D. Fink                                      /s/Ralph L. Schlosstein
- -------------------                                      -----------------------
Laurence D. Fink                                            Ralph L. Schlosstein
Chairman                                                               President




                                       1
<PAGE>


                                                                January 31, 1998
Dear Shareholder:

      We are  pleased to present  the annual  report for The  BlackRock  Insured
Municipal  2008 Term Trust Inc.  ("the  Trust") for the year ended  December 31,
1997. We would like to take this  opportunity  to review the Trust's stock price
and net asset  value  (NAV)  performance,  summarize  developments  in the fixed
income markets and discuss recent portfolio management activity.

      The Trust is a diversified,  actively  managed  closed-end bond fund whose
shares are traded on the New York Stock  Exchange  under the symbol  "BRM".  The
Trust's  investment  objective  is to  manage  a  portfolio  of  municipal  debt
securities  that  will  return  $15 per share (an  amount  equal to the  Trust's
initial public offering price) to investors on or about December 31, 2008, while
providing high current income exempt from regular  federal income tax. The Trust
seeks to achieve this  objective by investing in high credit  quality  ("AAA" or
insured to "AAA")  tax-exempt  general  obligation  and revenue  bonds issued by
city, county and state municipalities throughout the United States.

      The table below  summarizes the changes in the Trust's stock price and net
asset value over the past year:
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------
                                                12/31/97      12/31/96        CHANGE          HIGH           LOW
- -----------------------------------------------------------------------------------------------------------------
<S>                                              <C>           <C>             <C>           <C>           <C>   
  STOCK PRICE                                    $15.25        $14.50          5.17%         $15.25        $14.00
- -----------------------------------------------------------------------------------------------------------------
  NET ASSET VALUE (NAV)                          $16.80        $15.90          5.66%         $16.80        $15.52
- -----------------------------------------------------------------------------------------------------------------
</TABLE>

THE FIXED INCOME MARKETS

      The U.S.  economy  exhibited  strong growth and low inflation during 1997,
pushing  bond yields  below 6% for the first time since  early  1996.  Fueled by
increased consumer spending and low unemployment, growth was robust. The primary
inflation indicators,  consumer and producer prices, remained dormant throughout
the period and  unemployment  rate remained low. After  increasing the Fed Funds
Rate to 5.50% in March,  the Federal  Reserve  left the rate  unchanged  for the
remainder of the year, as the  combination  of slowing  domestic  growth and the
economic turmoil in Asia threatened to exert deflationary  pressures on the U.S.
economy.

      The positive  momentum has continued into the early days of 1998 based, in
part,  on the  possibility  of early  elimination  of the budget  deficit and on
comments by Fed Chairman  Greenspan that deflation was an issue.  New home sales
recently hit a new cyclical peak, the employment picture remains very strong and
consumer confidence and spending remain high. Despite the strong growth, current
and future inflation both appear to be controlled.

      Municipal bonds, as measured by the Lehman Municipal Bond Index,  posted a
9.20%  total  return for the year,  versus  9.68% for the  taxable  bond  market
(measured by the Lehman Aggregate Index).  The substantial  decline in municipal
interest rates resulted in 1997 being the third largest  issuance year on record
(a  19%  increase  over  1996),   which  negatively   impacted   municipal  bond
performance.  After  keeping pace with the  Treasury  market rally in the second
quarter,  municipals  cheapened in relation to Treasuries during the latter half
of the year due to reduced  participation  by retail investors at lower interest
rate levels and increased supply.

                                       2
<PAGE>


      Looking forward, we expect issuance of municipal  securities in 1998 to be
similar  to 1997  levels,  with an  increase  in new  supply  being  offset by a
decrease  in  refunding  supply.  BlackRock  remains  focused  on  high  quality
municipal  securities,  because the yield  advantage of  purchasing  lower rated
securities  remains  marginal.  The strong  state of the  economy is expected to
continue,  providing strong fundamentals for municipal issuers. We expect to see
more discussions  about tax reform towards the end of the first quarter of 1998,
which may create buying opportunities.

THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY

      The Trust's  portfolio is actively  managed to diversify  exposure  across
various  sectors,  issuers,  revenue  sources and  security  types.  BlackRock's
investment strategy emphasizes a relative value approach, which allows the Trust
to capitalize upon changing  market  conditions by rotating  municipal  sectors,
credits and coupons.  Portfolio  trading activity was very low during 1997, as a
majority of the bonds in the  portfolio  are trading at prices  which,  if sold,
would  result in a taxable  capital  gain.  Additionally,  as these  bonds  were
purchased in higher interest rate environments.  Were they to be sold, the Trust
would be forced to reinvest the proceeds in lower yielding  securities.  Both of
these  factors led us to decide that the most  prudent  investment  strategy for
1997 was to maintain the current portfolio structure.

      Additionally,  the  Trust  employs  leverage  to  enhance  its  income  by
borrowing at  short-term  municipal  rates and  investing the proceeds in longer
maturity  issues  that have  higher  yields.  The  degree to which the Trust can
benefit  from its use of  leverage  may affect its  ability to pay high  monthly
income. The Trust has experienced  favorable short-term municipal rates over the
past year. The Federal Reserve's  decision to raise the Fed funds target rate in
March 1997 did not  significantly  impact the short end of the  municipal  yield
curve, allowing the rates the Trust pays to preferred  shareholders (the Trust's
leverage cost) to remain affordable.

      The  following  charts  compare the Trust's  current and December 31, 1996
asset composition:
- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
- --------------------------------------------------------------------------------
   SECTOR                               DECEMBER 31, 1997   DECEMBER 31, 1996
- --------------------------------------------------------------------------------
   County, City & State                       25%                 33%
- --------------------------------------------------------------------------------
   Utility/Power                              22%                 21%
- --------------------------------------------------------------------------------
   Hospital                                   15%                 16%
- --------------------------------------------------------------------------------
   Transportation                              6%                  6%
- --------------------------------------------------------------------------------
   Water & Sewer                               6%                  6%
- --------------------------------------------------------------------------------
   Lease Revenue                               6%                  4%
- --------------------------------------------------------------------------------
   Education                                   6%                  2%
- --------------------------------------------------------------------------------
   Tax Revenue                                 6%                  1%
- --------------------------------------------------------------------------------
   Other                                       5%                  7%
- --------------------------------------------------------------------------------
   Housing                                     3%                  3%
- --------------------------------------------------------------------------------
   Building                                    --                  1%
- --------------------------------------------------------------------------------


                                       3
<PAGE>


      We appreciate  your continued  confidence and look forward to managing The
BlackRock  Insured Municipal 2008 Term Trust Inc. in the coming years to realize
its  investment  objectives.  Please  feel  free  to  contact  the  mutual  fund
specialists at BlackRock's marketing center at (800) 227-7BFM (7236) if you have
any questions that weren't answered in this report. Additionally,  you can reach
us via e-mail at [email protected].


Sincerely,

/s/Robert S. Kapito                     /s/Kevin Klingert
- -------------------                     -----------------
   Robert S. Kapito                        Kevin Klingert

Vice Chairman and Portfolio Manager     Managing Director and Portfolio Manager
BlackRock Financial Management, Inc.    BlackRock Financial Management, Inc.

- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
- --------------------------------------------------------------------------------
Symbol on New York Stock Exchange:                                BRM
- --------------------------------------------------------------------------------
Initial Offering Date:                                    September 18, 1992
- --------------------------------------------------------------------------------
Closing Stock Price as of 12/31/97:                             $15.25
- --------------------------------------------------------------------------------
Net Asset Value as of 12/31/97:                                 $16.80
- --------------------------------------------------------------------------------
Yield on Closing Stock Price as of 12/31/97 ($15.25)1:           5.21%
- --------------------------------------------------------------------------------
Current Monthly Distribution per Common Share2:                $0.06625
- --------------------------------------------------------------------------------
Current Annualized Distribution per Common Share2:             $0.7950
- --------------------------------------------------------------------------------

- ----------
1 Yield on Closing Stock Price is calculated by dividing the current  annualized
distribution per share by the closing stock price per share.

2 Distribution is not constant and is subject to change.


                                       4
<PAGE>

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
PORTFOLIO OF INVESTMENTS
DECEMBER 31, 1997
- --------------------------------------------------------------------------------
                                                                                                OPTION
           PRINCIPAL                                                                             CALL
   RATING*  AMOUNT                                                                           PROVISIONS+++     VALUE
 (UNAUDITED) (000)                                 DESCRIPTION                                (UNAUDITED)    (NOTE 1)
- ---------------------------------------------------------------------------------------------------------------------------

<S>         <C>      <C>                                                                  <C>             <C>
                     LONG-TERM INVESTMENTS -- 143.5%

                     ALABAMA -- 0.2%
   AAA      $1,905   Mobile Impvt. Wt., Zero Coupon, 8/15/08, MBIA .................... 08/02 at 71.587    $ 1,097,528
                                                                                                          ------------
                     ARIZONA -- 0.5%
   AAA       4,000   Chandler, G.O., Zero Coupon, 7/01/08, FGIC .........................  No Opt. Call      2,467,640
                                                                                                          ------------
                     CALIFORNIA -- 0.4%
   AAA       1,890   California Hlth. Facs. Fin. Auth. Rev., Marin Gen. Hosp., 
                        Ser. A, 5.75%, 8/01/09, FSA .....................................  08/03 at 102      2,012,737
                                                                                                          ------------
                     COLORADO -- 10.7%
   AAA       2,000   E-470 Pub. Hwy. Auth. Co. Rev. Cap. Apprec. Ser. B, 
                        Zero Coupon, 9/01/11, MBIA ......................................  No Opt. Call      1,022,020
   AAA      30,205   Jefferson Cnty., Sch. Dist. No. R-001, G.O., 6.25%,
                        12/15/02+, AMBAC ................................................  No Opt. Call     33,187,140
   AAA      13,285   Univ. of Colorado, Hosp. Auth. Rev., Ser. A, 6.25%,
                        11/15/02+, AMBAC ................................................  No Opt. Call     14,686,833
                                                                                                          ------------
                                                                                                            48,895,993
                                                                                                          ------------
                     DISTRICT OF COLUMBIA --  5.5%
                     Dist. of Columbia, G.O., MBIA,
   AAA       3,070      Ser. E, 5.875%, 6/01/08 .........................................  06/03 at 102      3,282,598
   AAA      17,950      Ser. B, 6.30%, 6/01/09 ..........................................  06/02 at 102     19,491,546
   AAA       2,000   Dist. of Columbia, Hosp. Rev., Children's Hosp., 
                        Ser. A, 6.25%, 7/15/08, FGIC ....................................  07/02 at 102      2,184,080
                                                                                                          ------------
                                                                                                            24,958,224
                                                                                                          ------------
                     GEORGIA --  1.7%
                     Atlanta, C.O.P., Pretrial Det. Ctr., MBIA,
   AAA       3,000      6.25%, 12/01/08 .................................................  12/02 at 102      3,285,540
   AAA       4,000      6.25%, 12/01/11 .................................................  12/02 at 102      4,356,600
                                                                                                          ------------
                                                                                                             7,642,140
                                                                                                          ------------
                     HAWAII -- 1.9%
   AAA       7,760   Honolulu, Hawaii City & Cnty., Ser. A, 5.80%, 1/01/07, FGIC ........  No Opt. Call      8,537,319
                                                                                                          ------------
                     ILLINOIS --  13.3%
   AAA      14,205   Chicago O'Hare Intl. Arprt. Rev., Ser. A, 6.25%, 1/01/08, MBIA .....  01/05 at 102     15,771,669
                     Chicago, Sch. Fin. Auth., G.O., Ser. A, FGIC,
   AAA      13,000      6.25%, 6/01/07 ..................................................  06/02 at 102     14,172,730
   AAA       9,150      6.25%, 6/01/09 ..................................................  06/02 at 102      9,940,743
                     Illinois Hlth. Facs. Auth. Rev.,
   AAA      11,000      Alexian Med. Ctr. Proj., Ser. A, 6.35%++, 1/01/08, MBIA .........  01/02 at 102     11,857,780
   AAA       2,500      Carle Foundation, Ser. A, 6.75%, 1/01/10, FGIC ..................  01/00 at 102      2,668,250
   AAA      10,170   Met. Pier & Expo. Auth., Ded. St. Tax Rev., 
                        Ser. A, Zero Coupon, 6/15/08, FGIC ..............................  No Opt. Call      6,254,753
                                                                                                          ------------
                                                                                                            60,665,925
                                                                                                          ------------
                     INDIANA --  2.4%
                     Indiana Hlth. Fac. Fin. Auth. Hosp. Rev. & Impvt., Ancilla Sys. Inc., 
                        MBIA,
   AAA       5,665      Ser. A, 6.25%, 7/01/08 ..........................................  07/02 at 102      6,146,922
   AAA       4,350      Ser. B, 6.25%, 7/01/08 ..........................................  07/02 at 102      4,720,055
                                                                                                          ------------
                                                                                                            10,866,977
                                                                                                          ------------
                     IOWA --  1.4%
   AAA       1,945   Iowa Fin. Auth., Sngl. Fam. Mtge. Rev., Ser. F, 6.35%, 7/01/09, 
                        AMBAC .............................................................01/03 at 102      2,062,070
   AAA       4,195   Muscatine, Elec. Rev., 5.00%, 1/01/08, FSA .........................  02/98 at 100      4,201,712
                                                                                                          ------------
                                                                                                             6,263,782
                                                                                                          ------------
                     KENTUCKY --  0.5%
   AAA       3,890   Owensboro, Elec. Lt. & Pwr. Rev., Ser. B, Zero Coupon, 1/01/09, 
                        AMBAC ..............................................................  No Opt. Call      2,320,152
                                                                                                          ------------
                     LOUISIANA --  1.2%
   AAA       5,000   Louisiana Pub. Facs. Auth. Hosp. Rev., 
                        Lafayette Gen. Med. Ctr. Proj.,
                        6.30%, 10/01/08, FSA ............................................  10/02 at 102      5,474,600
                                                                                                          ------------
</TABLE>

                       See Notes to Financial Statements.

                                       5
<PAGE>
<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                                                OPTION
           PRINCIPAL                                                                             CALL
   RATING*  AMOUNT                                                                           PROVISIONS+++     VALUE
 (UNAUDITED) (000)                                 DESCRIPTION                                (UNAUDITED)    (NOTE 1)
- ---------------------------------------------------------------------------------------------------------------------------
<S>         <C>      <C>                                                                  <C>             <C>
                     MASSACHUSETTS -- 4.8%
   AAA     $ 4,465   Chelsea, Sch. Proj. Loan, 6.00%, 6/15/09, AMBAC ....................  06/04 at 102   $  4,868,323
   AAA       6,000   Massachusetts Bay Trans. Auth. Rev., Ser. B, 6.00%, 3/01/10, MBIA ..  03/03 at 102      6,459,840
   AAA      10,000   Massachusetts St. Hsg. Fin. Agcy., Hsg. Proj., 
                        Ser. A, 5.95%, 10/01/08, AMBAC ..................................  04/03 at 102     10,714,800
                                                                                                          ------------
                                                                                                            22,042,963
                                                                                                          ------------
                     MICHIGAN -- 5.1%
                     Lake Orion, Cmnty. Sch. Dist., AMBAC,
   AAA       3,290      6.60%, 5/01/05+ .................................................  No Opt. Call      3,784,684
   AAA       3,285      6.70%, 5/01/05+ .................................................  No Opt. Call      3,799,365
   AAA       8,920   Michigan St. Bldg. Auth. Rev., Facs. Proj., 
                        Ser. IIA, 6.25%, 10/01/08, AMBAC ................................  10/02 at 102      9,767,935
   AAA       1,760   Western Michigan Univ. Rev., 6.20%, 11/15/02+, FGIC ................  No Opt. Call      1,941,896
   AAA       3,400   Wyandotte, Elec. Rev., 6.25%, 10/01/08, MBIA .......................  No Opt. Call      3,922,784
                                                                                                          ------------
                                                                                                            23,216,664
                                                                                                          ------------
                     MISSOURI -- 1.6%
   AAA       6,600   Kansas City, Sch. Dist. Bldg. Corp. Leasehold Rev., Cap. Impvts. Proj.,
                        Ser. A, 6.50%, 2/01/08, FGIC ....................................  02/01 at 102      7,136,844
                                                                                                          ------------
                     NEVADA -- 3.9%
   AAA       6,490   Clark Cnty., Fld. Ctrl., 6.30%, 11/01/01+, AMBAC ...................  No Opt. Call      7,033,148
                     Washoe Cnty., Arpt. Auth., Ser. B, MBIA,
   AAA       3,135      5.70%, 7/01/07 ..................................................  07/03 at 102      3,375,580
   AAA       2,645      5.75%, 7/01/08 ..................................................  07/03 at 102      2,840,915
   AAA       4,135   Washoe Cnty., Sch. Dist., G.O., Ser. A, 6.20%, 10/01/02+, AMBAC ....  No Opt. Call      4,511,161
                                                                                                          ------------
                                                                                                            17,760,804
                                                                                                          ------------
                     NEW JERSEY -- 13.0%
   AAA      30,275   New Jersey Econ. Dev. Auth., Mkt. Trans. Fac. Rev., 
                        Ser. A, 5.80%, 7/01/08, MBIA ....................................  07/04 at 102     32,865,329
   AAA      24,495   New Jersey St. G.O., Ser. D, 6.00%, 2/15/09, MBIA ..................  02/03 at 102     26,595,446
                                                                                                          ------------
                                                                                                            59,460,775
                                                                                                          ------------
                     NEW YORK -- 8.3%
                     New York City G.O., Ser. E, MBIA,
   AAA       5,000      6.125%, 8/01/06 .................................................  No Opt. Call      5,615,150
   AAA      15,500      6.20%, 8/01/07 ..................................................  No Opt. Call     17,601,025
   AAA       5,000      Ser. G, 5.75%, 2/01/08 .........................................02/06 at 101.50      5,457,800
                     New York St. Environ. Facs. Corp., Poll. Ctrl. Rev., Ser. D,
   AAA       5,945      6.50%, 5/15/07 ..................................................  11/04 at 102      6,799,475
   AAA       2,245      6.50%, 11/15/07 .................................................  11/04 at 102      2,567,674
                                                                                                          ------------
                                                                                                            38,041,124
                                                                                                          ------------
                     NORTH CAROLINA -- 8.8%
   AAA       1,000   Cumberland Cnty. C.O.P., Civic Ctr. Proj., 
                        Ser. A, 6.375%, 12/01/09, AMBAC .................................  12/04 at 102      1,122,970
                     North Carolina Eastn. Mun. Pwr. Agcy. Rev., Ser. B,
   AAA      13,500      6.125%, 1/01/09, FGIC ...........................................  No Opt. Call     15,280,380
   AAA       5,000      7.00%, 1/01/08, CAPMAC ..........................................  No Opt. Call      5,968,050
   AAA      14,675      7.25%, 1/01/07, CAPMAC ..........................................  No Opt. Call     17,660,629
                                                                                                          ------------
                                                                                                            40,032,029
                                                                                                          ------------
                     NORTH DAKOTA -- 1.1%
   AAA       4,450   Bismark Hosp. Rev., St. Alexius Med. Ctr., 6.90%, 5/01/06, AMBAC ...  05/01 at 102      4,894,377
                                                                                                          ------------
                     OHIO -- 2.3%
   AAA       2,410   Cleveland, G.O., 6.40%, 11/15/04+, MBIA ............................  No Opt. Call      2,743,689
   AAA       6,095   Hamilton City, Elec. Sys. Rev., Ser. A, 6.125%, 10/15/08, FGIC .....  10/02 at 102      6,645,317
   AAA       1,000   Ohio St. Bldg. Auth., Facs. Rev., Juvenile Correctional Proj.,
                        6.50%, 10/01/09, AMBAC ..........................................  10/04 at 102      1,127,970
                                                                                                          ------------
                                                                                                            10,516,976
                                                                                                          ------------
</TABLE>
                       See Notes to Financial Statements.


                                       6
<PAGE>
<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                                                OPTION
           PRINCIPAL                                                                             CALL
   RATING*  AMOUNT                                                                           PROVISIONS+++     VALUE
 (UNAUDITED) (000)                                 DESCRIPTION                                (UNAUDITED)    (NOTE 1)
- ---------------------------------------------------------------------------------------------------------------------------
<S>         <C>      <C>                                                                  <C>             <C>
                     PENNSYLVANIA -- 13.2%
   AAA     $ 4,000   Allegheny Cnty. Hosp. Dev. Auth. Rev., Magee Women's Hosp., 
                        6.25%, 10/01/08, FGIC ...........................................  10/02 at 102   $  4,371,200
                     Dauphin Cnty. Gen. Auth. Hosp. Rev., HAPSCO-Western Pennsylvania 
   AAA      10,000      Hosp. Proj., MBIA, 6.25%, Ser. A, 7/01/08 .......................  07/02 at 102     10,893,400
   AAA       5,000      6.25%, 7/01/08 ..................................................  07/02 at 102      5,446,700
   AAA       6,600   Erie Cnty. Hosp. Auth. Rev., St. Vincent Hlth. Ctr. Proj., 
                        Ser. A, 6.25%, 7/01/08, MBIA ....................................  07/02 at 102      7,203,768
   AAA       3,500   Indiana Cnty. Indl. Dev. Auth., Poll. Ctrl. Rev., New York St. 
                        Elec. & Gas Corp., Ser. A, 6.00%, 6/01/06, MBIA .................  No Opt. Call      3,882,655
   AAA       6,500   Pennsylvania Hsg. Fin. Agcy. Rev., Rental Hsg.,
                        Ser. C, 6.25%, 7/01/07, FNMA ....................................  07/02 at 102      6,929,715
   AAA       7,450   Pennsylvania St., G.O., Ser. A, 6.50%, 11/01/01+, FGIC .............  No Opt. Call      8,157,452
   AAA      10,930   Pittsburgh, G.O., Ser. D, 6.00%, 9/01/08, AMBAC ....................  09/02 at 102     11,832,272
   AAA       1,665   Scranton-Lackawanna Hlth. & Welfare Auth. Rev., 
                        6.90%, 1/01/00+, MBIA ...........................................  No Opt. Call      1,786,079
                                                                                                          ------------
                                                                                                            60,503,241
                                                                                                          ------------
                     TEXAS -- 24.2%
                     Austin, Pub. Impvt., G.O., AMBAC,
   AAA       4,000      6.10%, 9/01/07 ..................................................  09/02 at 100      4,291,920
   AAA       4,000      6.10%, 9/01/08 ..................................................  09/02 at 100      4,276,280
   AAA       5,000      6.10%, 9/01/09 ..................................................  09/02 at 100      5,323,700
                     Austin, Util. Sys. Rev.,
   AAA      11,515      Ser. A, Zero Coupon, 11/15/08, MBIA .............................  No Opt. Call      6,946,193
   AAA       5,000      Ser. A, Zero Coupon, 11/15/09, AMBAC ............................  No Opt. Call      2,846,000
   AAA       5,000      Ser. A, Zero Coupon, 11/15/09, MBIA .............................  No Opt. Call      2,846,000
   AAA       5,000      6.625%, 11/15/08, AMBAC .........................................  No Opt. Call      5,865,200
   AAA       7,000      6.25%, 11/15/08, AMBAC ..........................................  11/02 at 102      7,661,780
   AAA       5,225   Baytown, G.O., 6.40%, 2/01/08, AMBAC ...............................  02/02 at 100      5,631,975
   AAA       9,930   Circle C Mun. Util. Dist. No. 3 Rev., 6.50%, 11/15/09, FGIC ........  11/01 at 100     10,694,709
                     Coppell Indpt. Sch. Dist., MBIA,
   AAA       1,430      6.10%, 8/15/09 ..................................................  No Opt. Call      1,602,944
   AAA       2,495      6.10%, 8/15/09 ..................................................  08/02 at 100      2,655,129
   AAA       4,390   Houston Indpt. Sch. Dist., Zero Coupon, 8/15/09, AMBAC .............  No Opt. Call      2,528,596
   AAA      16,135   Houston, Wtr. & Swr. Sys. Rev., Jr. Lien,
                        Ser. C, 6.25%, 12/01/09, MBIA ...................................  12/02 at 102     17,670,729
   AAA       6,000   San Antonio Elec. & Gas Rev., Ser. B, Zero Coupon, 2/01/10, FGIC ...  No Opt. Call      3,341,460
                     Texas Mun. Pwr. Agcy. Rev., AMBAC,
   AAA      15,000      Zero Coupon, 9/01/08 ............................................  No Opt. Call      9,135,300
   AAA      16,175      Zero Coupon, 9/01/09 ............................................  No Opt. Call      9,297,067
   AAA       5,900   Texas St. Pub. Fin. Auth. Bldg. Rev., Ser. B, 6.25%, 2/01/09, AMBAC   No Opt. Call      6,784,823
   AAA       2,275   Ysleta, Indpt. Sch. Dist. Rev., Zero Coupon, 8/15/08, PSFG .........  No Opt. Call      1,388,387
                                                                                                          ------------
                                                                                                           110,788,192
                                                                                                          ------------
                     UTAH -- 1.2%
   AAA       3,500   Intermountain Pwr. Agcy. Rev. Ser. B, 6.00%, 7/01/07, MBIA .........  No Opt. Call      3,908,800
   AAA       1,550   Salt Lake Cnty. Mun. Bldg. Auth. Lease Rev., 
                        Ser. A, 6.05%, 10/01/08, MBIA ...................................  10/04 at 101      1,696,739
                                                                                                          ------------
                                                                                                             5,605,539
                                                                                                          ------------
                     WASHINGTON -- 13.7%
   AAA      12,850   King Cnty. Ser. D, 5.55%, 12/01/08, MBIA ...........................  12/07 at 102     13,939,680
   AAA       9,000   Seattle Hlth. Care Facs. Auth. Rev., Virginia Mason Oblig. Group, 
                        6.30%, 2/15/09, MBIA ............................................  02/03 at 102      9,859,230
   AAA       4,000   Snohomish Cnty, Sch. Dist., 6.10%, 12/01/08, MBIA ..................  12/03 at 102      4,387,040
   AAA       3,000   Washington St. Pub. Pwr. Supply Sys. Rev. 5.55%, 7/01/10, FGIC .....  07/03 at 102      3,100,140
                     Washington St. Pub. Pwr. Supply Sys. Rev.,
   AAA       5,550      No. 3, Zero Coupon, 7/01/07, BIG ................................  No Opt. Call      3,584,911
   AAA       2,000      No. 3, Zero Coupon, 7/01/08, BIG ................................  No Opt. Call      1,221,220
   AAA      11,000      5.80%, 7/01/07, FSA .............................................  No Opt. Call     12,027,070
   AAA      13,635      No. 2, Ser. A, 6.25%, 7/01/09, MBIA .............................  07/02 at 102     14,765,887
                                                                                                          ------------
                                                                                                            62,885,178
                                                                                                          ------------
                     WEST VIRGINIA -- 2.6%
   AAA      11,600   West Virginia St. Parkways Econ. Dev. & Tourism Auth.,
                        3.60%++, 5/15/09, FGIC ..........................................  05/03 at 102     12,090,796
                                                                                                          ------------
                     Total Long-Term Investments (cost $591,147,909)                                       656,178,519
                                                                                                          ------------
</TABLE>

                       See Notes to Financial Statements.


                                       7
<PAGE>
<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                                                OPTION
           PRINCIPAL                                                                             CALL
   RATING*  AMOUNT                                                                           PROVISIONS+++     VALUE
 (UNAUDITED) (000)                                 DESCRIPTION                                (UNAUDITED)    (NOTE 1)
- ---------------------------------------------------------------------------------------------------------------------------
<S>         <C>      <C>                                                                  <C>             <C>
                     SHORT-TERM INVESTMENTS** -- 0.6%
                     CONNECTICUT -- 0.1%
   A1+       $ 300   Connecticut St. Dev. Auth. Poll. Ctrl. Rev., Western Mass. Elec. Co.,
                        Ser. A, FRDD, 3.50%, 1/02/98 ....................................                  $   300,000
                                                                                                          ------------
                     MISSISSIPPI
   P1          100   Perry Cnty. Poll. Ctrl. Rev., Leaf River Forest Proj., FRDD, 5.00%, 
                        1/02/98.............................................................                   100,000
                                                                                                          ------------
                     NEW YORK -- 0.2%
   A1+         800   New York St. Energy Res. & Dev. Auth. Poll. Ctrl. Rev., 
                        Ser. C., FRDD, 4.10%, 1/02/98 ...................................                      800,000
                                                                                                          ------------
                     WASHINGTON
   A1+         200   Washington St. Hlth. Care Facs. Auth. Rev., FRDD, 5.00%, 1/02/98 ...                      200,000
                                                                                                          ------------
                     WYOMING -- 0.3%
   P1          300   Uinta Cnty. Poll. Ctrl. Rev., Chevron Inc. Proj., FRDD, 5.00%, 1/02/98                    300,000
   P1        1,000   Uinta Cnty. Poll. Ctrl. Rev.,  FRDD, 5.00%, 1/02/98 ................                    1,000,000
                                                                                                          ------------
                                                                                                             1,300,000
                                                                                                          ------------
                     TOTAL SHORT-TERM INVESTMENTS (cost $2,700,000) .....................                    2,700,000
                                                                                                          ------------
                     TOTAL INVESTMENTS-- 144.1% (cost $593,847,909) .....................                  658,878,519
                     Other assets in excess of liabilities-- 1.0% .......................                    4,313,602
                     Liquidation value of preferred stock-- (45.1%) .....................                 (206,000,000)
                                                                                                          ------------
                     NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS-- 100% ................                $ 457,192,121
                                                                                                          ============

- ----------
   *Rating: using the higher of Standard & Poor's, Moody's or Fitch's.
 **For  purposes  of  amortized  cost  valuation,  the  maturity  date of  these
    instruments  is  considered  to be the  later of the next  date on which the
    security  can be  redeemed  at par or the  next  date on  which  the rate of
    interest is adjusted.
   +This bond is prerefunded. See glossary for definition.
  ++This bond contains embedded caps. See glossary for definition.
+++Option call  provisions:  date  (month/year) and price of the earliest option
    call or redemption.  There may be other call provisions at varying prices at
    later dates.

</TABLE>

- --------------------------------------------------------------------------------
                         KEY TO ABBREVIATIONS
        AMBAC    -- American Municipal Bond Assurance Corporation
        BIG      -- Bond Investors Guaranty Insurance Company
        CAPMAC   -- Capital Markets Assurance Company
        C.O.P.   -- Certificate of Participation
        FNMA     -- Federal National Mortgage Association
        FGIC     -- Financial Guaranty Insurance Company
        FSA      -- Financial Security Assurance
        FRDD     -- Floating Rate Daily Demand**
        G.O.     -- General Obligation Bond
        MBIA     -- Municipal Bond Insurance Association
        PSFG     -- Permanent School Fund Guaranty
- --------------------------------------------------------------------------------

                       See Notes to Financial Statements.


                                       8
<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1997
- --------------------------------------------------------------------------------
ASSETS

Investments, at value (cost $593,847,909)
  (Note 1) ................................ $658,878,519
Interest receivable .......................   10,071,172
Receivable for investments sold ...........      155,000
Cash ......................................       59,962
Other assets ..............................       53,814
                                            ------------
                                             669,218,467
                                            ------------
LIABILITIES
Payable for investments purchased .........    5,216,500
Dividends payable--preferred stock ........      196,087
Advisory fee payable (Note 2) .............      193,423
Administration fee payable (Note 2) .......       55,264
Other accrued expenses ....................      365,072
                                            ------------
                                               6,026,346
                                            ------------
NET INVESTMENT ASSETS ..................... $663,192,121
                                            ============
Net investment assets were comprised of:
  Common stock:
    Par value (Note 4) ....................    $ 272,071
    Paid-in capital in excess of par ......  378,448,786
  Preferred stock (Note 4) ................  206,000,000
                                            ------------
                                             584,720,857
  Undistributed net investment income .....   13,734,022
  Accumulated net realized loss ...........     (293,368)
  Net unrealized appreciation .............   65,030,610
                                            ------------
  Net investment assets, December 31, 1997  $663,192,121
                                            ============
  Net assets applicable to common
    shareholders .......................... $457,192,121
                                            ============
Net asset value per common share:
  ($457,192,121 / 27,207,093 shares of
  common stock issued and outstanding) ....       $16.80
                                                  ======


- --------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF OPERATIONS
YEAR ENDED DECEMBER 31, 1997
- --------------------------------------------------------------------------------

NET INVESTMENT INCOME
Income
  Interest and discount earned ............  $36,058,019
                                             -----------
Expenses
  Investment advisory .....................    2,246,318
  Administration ..........................      641,805
  Auction agent ...........................      552,000
  Custodian ...............................      137,000
  Reports to shareholders .................       92,000
  Directors ...............................       84,000
  Audit ...................................       37,000
  Transfer agent ..........................       28,000
  Legal ...................................       18,000
  Miscellaneous ...........................      248,311
                                             -----------
  Total expenses ..........................    4,084,434
                                             -----------
Net investment income .....................   31,973,585
                                             -----------
REALIZED AND UNREALIZED GAIN ON
INVESTMENTS (NOTE 3)
Net realized gain on investments ..........      172,902
Net change in unrealized appreciation on
  investments .............................   21,311,862
                                             -----------
Net gain on investments ...................   21,484,764
                                             -----------
NET INCREASE IN NET INVESTMENT
  ASSETS RESULTING FROM OPERATIONS ........  $53,458,349
                                             ===========

                       See Notes to Financial Statements.


                                       9
<PAGE>
<TABLE>
c
- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS
- --------------------------------------------------------------------------------

                                                                                            YEAR ENDED DECEMBER 31,
                                                                                         -----------------------------
                                                                                            1997              1996
                                                                                         -----------       -----------
<S>                                                                                     <C>              <C>         
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
Operations:
  Net investment income ..............................................................  $ 31,973,585     $ 31,818,443
  Net realized gain on investments ...................................................       172,902        1,317,650
  Net change in unrealized appreciation (depreciation) on investments ................    21,311,862       (8,498,403)
                                                                                        ------------     ------------
  Net increase in net investment assets resulting from operations ....................    53,458,349       24,637,690
                                                                                        ------------     ------------
Dividends and Distributions:
  To common shareholders from net investment income ..................................   (21,498,340)     (21,372,846)
  To common shareholders from net realized gain on investments .......................            --         (910,757)
  To common shareholders in excess of net realized gain on investments ...............      (130,975)         (73,650)
  To preferred shareholders from net investment income ...............................    (7,203,821)      (6,835,483)
  To preferred shareholders from net realized gain on investments ....................            --         (282,838)
  To preferred shareholders in excess of net realized gain on investments ............       (41,921)         (22,866)
                                                                                        ------------     ------------
  Total dividends and distributions ..................................................   (28,875,057)     (29,498,440)
                                                                                        ------------     ------------
    Total increase (decrease) ........................................................    24,583,292       (4,860,750)
NET INVESTMENT ASSETS
Beginning of year ....................................................................   638,608,829      643,469,579
                                                                                        ------------     ------------
End of year ..........................................................................  $663,192,121     $638,608,829
                                                                                        ============     ============
</TABLE>

                       See Notes to Financial Statements.


                                       10
<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                                          YEAR ENDED DECEMBER 31,
                                                    -----------------------------------------------------------------
                                                       1997           1996         1995         1994          1993
                                                     --------       --------     ---------    --------      ---------
<S>                                                  <C>            <C>           <C>          <C>          <C>    
PER COMMON SHARE OPERATING
  PERFORMANCE:
Net asset value, beginning of the year ............  $ 15.90        $ 16.08       $ 13.88      $ 16.23      $ 14.31
                                                     -------        -------       -------      -------      -------
Net investment income .............................     1.18           1.17          1.19         1.15         1.14
Net realized and unrealized gain (loss)
 on investments ...................................     0.78          (0.27)         2.21        (2.39)        1.91
                                                     -------        -------       -------      -------      -------
Net increase (decrease) from investment operations      1.96           0.90          3.40        (1.24)        3.05
                                                     -------        -------       -------      -------      -------
Dividends from net investment income to:
   Preferred shareholders .........................    (0.27)         (0.25)        (0.28)       (0.23)       (0.20)
   Common shareholders ............................    (0.79)         (0.79)        (0.83)       (0.88)       (0.88)
Distributions from net realized gain on investments to:
   Preferred shareholders .........................       --          (0.01)        (0.02)          --        (0.01)
   Common shareholders ............................       --          (0.03)        (0.06)          --        (0.04)
Distributions in excess of net realized gain on investments to:
   Preferred shareholders .........................       **             **            **           --           --
   Common shareholders ............................       **             **         (0.01)          --           --
                                                     -------        -------       -------      -------     -------
Total dividends and distributions .................    (1.06)         (1.08)        (1.20)       (1.11)       (1.13)
                                                     -------        -------       -------      -------      -------
Net asset value, end of year* .....................  $ 16.80        $ 15.90       $ 16.08      $ 13.88      $ 16.23
                                                     =======        =======       =======      =======      =======
Market value, end of year* ........................  $ 15.25        $ 14.50       $ 13.50      $ 12.25      $15.125
                                                     =======        =======       =======      =======      =======
TOTAL INVESTMENT RETURN + .........................   10.97%         13.56%        17.64%     (13.71)%       16.05%
                                                     =======        =======       =======      =======      =======
RATIOS TO AVERAGE NET ASSETS OF
  COMMON SHAREHOLDERS: ++

Expenses                                               0.92%          0.95%         0.95%        1.02%        0.88%
Net investment income before preferred stock dividends 7.19%          7.32%         7.74%        7.80%        7.43%
Preferred stock dividends                              1.03%          1.64%         1.97%        1.55%        1.35%
Net investment income available to common shareholders 5.56%          5.68%         5.77%        6.25%        6.08%
SUPPLEMENTAL DATA:

Average net assets of common shareholders
 (in thousands)                                     $444,895       $434,692      $417,017      $400,555     $420,532
Portfolio turnover                                       11%             8%           27%           64%          15%
Net assets of common shareholders, end of year
 (in thousands)                                     $457,192       $432,609      $437,470      $377,679     $441,543
Preferred stock outstanding (in thousands)          $206,000       $206,000      $206,000      $206,000     $206,000
Asset coverage per share of preferred stock,
 end of year#                                       $ 80,484       $ 77,501      $ 78,091      $141,670     $157,171
</TABLE>

- ----------

   * Net asset value and market value are  published in THE WALL STREET  JOURNAL
     each Monday.

  ** Actual amount paid to common  shareholders was $0.004814,  and $0.00271 for
     the years ended  December 31, 1997,  and 1996  respectively.  Actual amount
     paid to preferred  shareholders  was  $0.00154,  $0.00084 and $0.002929 per
     common  share  for the  years  ended  December  31,  1997,  1996  and  1995
     respectively.

   # A stock split occurred on July 24, 1995 (Note 4).

   + Total investment  return is calculated  assuming a purchase of common stock
     at the  current  market  price on the first  day and a sale at the  current
     market price on the last day of the period. Dividends and distributions, if
     any,  are assumed for  purposes of this  calculation  to be  reinvested  at
     prices  obtained  under  the  Trust's  dividend  reinvestment  plan.  Total
     investment return does not reflect brokerage commissions.

  ++ Ratios  calculated  on the basis of income and expenses  applicable to both
     the common and preferred shares, and preferred stock dividends, relative to
     the average net assets of common shareholders.

The information  above represents the audited  operating  performance data for a
share of common stock outstanding,  total investment  return,  ratios to average
net assets and other supplemental data for the years indicated. This information
has been determined based upon financial  information  provided in the financial
statements and market value data for Trust's shares.

                       See Notes to Financial Statements.


                                       11
<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

NOTE 1. ACCOUNTING  POLICIES  

The  BlackRock  Insured  Municipal  2008 Term  Trust  Inc.  (the  "Trust"),  was
organized in Maryland on August 7, 1992 as a diversified,  closed-end management
investment company.  The Trust's investment objective is to manage a diversified
portfolio of high quality securities that will return $15 per share to investors
on or about December 31, 2008 while providing current income exempt from regular
federal income tax. The ability of issuers of debt  securities held by the Trust
to meet their  obligations  may be  affected  by  economic  developments  in the
specific  industry  or  region.  No  assurance  can be given  that  the  Trust's
investment objective will be achieved. The following is a summary of significant
accounting policies followed by the Trust.

   The following is a summary of significant accounting policies followed by the
Trust:

SECURITIES VALUATION:  Municipal securities  (including  commitments to purchase
such  securities  on a  "when-issued"  basis)  are valued on the basis of prices
provided  by  a  pricing  service  which  uses   information   with  respect  to
transactions  in bonds,  quotations  from bond dealers,  market  transactions in
comparable   securities  and  various   relationships   between   securities  in
determining values. Any securities or other assets for which such current market
quotations  are not readily  available are valued at fair value as determined in
good faith under procedures established by and under the general supervision and
responsibility of the Trust's Board of Directors.

   Short-term securities which mature in 60 days or less are valued at amortized
cost,  if their  term to  maturity  from  date of  purchase  is 60 days or less.
Short-term securities with a term to maturity greater than 60 days from the date
of purchase are valued at current market  quotations until maturity.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME:  Securities  transactions  are
recorded  on the trade date.  Realized  gains and losses are  calculated  on the
identified cost basis.  Interest income is recorded on the accrual basis and the
Trust  amortizes  premium and accretes  original  issue  discount on  securities
purchased  using the interest  method. 

FEDERAL  INCOME  TAXES:  It is the  Trust's  intention  to  continue to meet the
requirements  of the Internal  Revenue Code  applicable to regulated  investment
companies  and to distribute  sufficient  net income to  shareholders.  For this
reason and because  substantially  all of the Trust's  gross income  consists of
tax-exempt interest, no federal income tax provision is required.

DIVIDENDS  AND  DISTRIBUTIONS:   The  Trust  declares  and  pays  dividends  and
distributions to common  shareholders  monthly from net investment  income.  Net
capital  gains,  if any,  in excess  of loss  carryforwards  may be  distributed
annually.  Dividends and  distributions  are recorded on the  ex-dividend  date.
Dividends and distributions to preferred shareholders are accrued and determined
as described in Note 4. 

ESTIMATES:  The preparation of financial statements in conformity with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect the  reported  amounts of assets and  liabilities  and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the  reported  amounts  of  revenues  and  expenses  during  the
reporting period. Actual results could differ from those estimates.

NOTE 2. AGREEMENTS

The  Trust  has  an  Investment  Advisory  Agreement  with  BlackRock  Financial
Management,  Inc. (the  "Adviser") a  wholly-owned  corporate  subsidiary of PNC
Asset  Management  Group,  Inc., the holding company for PNC's asset  management
businesses and an Administration Agreement with Princeton  Administrators,  L.P.
(the  "Administrator"),  an indirect wholly owned  subsidiary of Merrill Lynch &
Co., Inc.

   The  investment  advisory  fee paid to the  Adviser  is  computed  weekly and
payable  monthly at an annual  rate of 0.35% of the Trust's  average  weekly net
investment  assets.  The  administration  fee paid to the  Administrator is also
computed  weekly and  payable  monthly at an annual rate of 0.10% of the Trust's
average weekly net investment assets.

   Pursuant to the agreements,  the Adviser provides  continuous  supervision of
the investment  portfolio and pays the compensation of officers of the Trust who
are  affiliated  persons of the Adviser.  The  Administrator  pays occupancy and
certain  clerical and accounting  costs of the Trust.  The Trust bears all other
costs and expenses.

NOTE 3. PORTFOLIO SECURITIES 

Purchases and sales of investment securities, other than short-term investments,
for the year ended December 31, 1997,  aggregated  $71,325,773 and  $70,896,750,
respectively.


                                       12
<PAGE>


   The federal income tax basis of the Trust's investments at December 31, 1997,
was  $594,153,692,  and accordingly,  gross and net unrealized  appreciation was
$64,724,827.

NOTE 4. CAPITAL

There are 200 million shares of $.01 par value common stock  authorized.  Of the
27,207,093  common shares  outstanding  at December 31, 1997,  the Adviser owned
7,093  shares.  As of  December  31,  1997,  there were 8,240  preferred  shares
outstanding as follows: Series T28-2,060,  Series R28-2,060, Series T7-2,060 and
Series R7-2,060.

   The Trust may classify or reclassify any unissued shares of common stock into
one or more  series  of  preferred  stock.  On  November  23,  1992,  the  Trust
reclassified  4,120 shares of common stock and issued 4 series of Auction Market
Preferred Stock ("Preferred Stock") as follows: Series T28--1,030 shares, Series
R28--1,030  shares,  Series R7--1,030 shares and series  T7--1,030  shares.  The
Preferred  Stock  has  a  liquidation  value  of  $25,000  per  share  plus  any
accumulated but unpaid dividends.

   On May 16, 1995  shareholders  approved a proposal to split each share of the
Trust's   Auction   Rate   Municipal   Preferred   Stock  into  two  shares  and
simultaneously  reduce  each  share's  liquidation  preference  from  $50,000 to
$25,000. The split occurred on July 24, 1995.

   Dividends on Series T7 and R7 are cumulative at a rate which is reset every 7
days based on the results of an auction.  Dividends on Series T28 are cumulative
at a rate  which is reset  every 28 days  based on the  results  of an  auction.
Series R28 paid dividends  monthly at a rate established at the initial offering
through May 17, 1994. Thereafter,  rates on Series R28 reset every 28 days based
on results of an auction. Dividend rates ranged from 2.50% to 4.50% for the year
ended December 31,1997.

   The Trust may not declare dividends or make other  distributions on shares of
common  stock or purchase  any such  shares if, at the time of the  declaration,
distribution  or  purchase,  asset  coverage  with  respect  to the  outstanding
Preferred Stock would be less than 200%.

   The Preferred  Stock is redeemable at the option of the Trust, in whole or in
part, on any dividend  payment date at $25,000 per share plus any accumulated or
unpaid dividends whether or not declared. The Preferred Stock is also subject to
mandatory  redemption  at  $25,000  per  share  plus any  accumulated  or unpaid
dividends,  whether or not  declared  if certain  requirements  relating  to the
composition  of the  assets  and  liabilities  of the  Trust as set forth in the
Articles of Incorporation are not satisfied.

   The holders of  Preferred  Stock have voting  rights  equal to the holders of
common stock (one vote per share) and will vote  together with holders of shares
of common stock as a single class. However,  holders of Preferred Stock are also
entitled to elect two of the Trust's  directors.  In  addition,  the  Investment
Company Act of 1940 requires that along with approval by stockholders that might
otherwise  be  required,  the  approval  of the  holders  of a  majority  of any
outstanding  preferred shares, voting separately as a class would be required to
(a) adopt any plan of  reorganization  that would adversely affect the Preferred
Stock, and (b) take any action requiring a vote of security holders,  including,
among other  things,  changes in the Trust's  subclassification  as a closed-end
investment company or changes in its fundamental investment restrictions.

NOTE 5. DIVIDENDS

Subsequent to December 31, 1997,  the Board of Directors of the Trust declared a
dividend  from  undistributed  earnings of  $0.06625  per common  share  payable
January 31, 1998 to  shareholders  of record on January 15, 1998. 

   For the period January 1, 1998 through January 31, 1998,  dividends  declared
on preferred  shares  totalled  $590,180 in aggregate  for the four  outstanding
preferred stock series.


                                       13
<PAGE>


- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                         REPORT OF INDEPENDENT AUDITORS
- --------------------------------------------------------------------------------

The Shareholders and
Board of Directors of
The BlackRock Insured Municipal 2008 Term Trust Inc.:

We have audited the accompanying statement of assets and liabilities,  including
the portfolio of investments, of The BlackRock Insured Municipal 2008 Term Trust
Inc. as of December 31, 1997,  and the related  statements of operations for the
year then  ended,  and of changes in net  investment  assets for each of the two
years in the period then ended and the financial highlights for each of the five
years in the  period  then  ended.  These  financial  statements  and  financial
highlights are the responsibility of the Trust's management.  Our responsibility
is to express an opinion on these financial  statements and financial highlights
based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about  whether the  financial  statements  and  financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements. Our procedures included confirmation of securities owned at December
31, 1997, by correspondence  with the custodian and brokers;  where replies were
not received from brokers, we performed other auditing procedures. An audit also
includes assessing the accounting principles used and significant estimates made
by  Management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  such  financial  statements  and financial  highlights  present
fairly,  in all  material  respects,  the  financial  position of The  BlackRock
Insured  Municipal  2008 Term Trust Inc. as of December 31, 1997, the results of
its  operations,  the  changes in its net  investment  assets and the  financial
highlights  for the  respective  stated  periods,  in conformity  with generally
accepted accounting principles.



/s/Deloitte & Touche, LLP
- -------------------------
Deloitte & Touche, LLP

New York, New York
February 13, 1998


                                       14
<PAGE>


- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                                 TAX INFORMATION
- --------------------------------------------------------------------------------

      We are required by the Internal  Revenue Code to advise you within 60 days
of the Trust's  fiscal year end as to the federally  exempt  interest  dividends
received by you during such fiscal year.  Accordingly,  we are advising you that
during the year ended  December  31, 1997 the Trust paid a total of $0.790186 in
dividends per common share that were federally tax-exempt interest dividends.

      Additionally,  the following summarizes the special taxable  distributions
declared by the Trust during the fiscal year:
<TABLE>
<CAPTION>

                                                                                                          LONG-TERM
                                                          RECORD                   PAYABLE                CAPITAL GAINS
                                                          DATE                     DATE                   PERSHARE*
                                                          -------                  -------                ----------
<S>                                                       <C>                      <C>                    <C>      
Common Stock                                              12/15/97                 12/31/97               $0.004814
Preferred Stock:
     Series T-7                                           12/01/97                 12/02/97               $5.03
     Series R-7                                           11/19/97                 11/20/97               $4.97
     Series T-28                                          12/22/97                 12/23/97               $5.22
     Series R-28                                          12/10/97                 12/11/97               $5.13
</TABLE>
* Long-term capital gains taxable at the 28% rate.

For purposes of preparing your annual federal  income tax return,  however,  you
should  report the amounts as  reflected  on the  appropriate  Form  1099-DIV or
substitute 1099 DIV.

- --------------------------------------------------------------------------------
                           DIVIDEND REINVESTMENT PLAN
- --------------------------------------------------------------------------------

      Pursuant  to  the  Trust's  Dividend   Reinvestment   Plan  (the  "Plan"),
shareholders may elect to have all  distributions of dividends and capital gains
automatically reinvested by State Street Bank & Trust Company (the "Plan Agent")
in Trust shares.  Shareholders  who do not  participate in the Plan will receive
all distributions in cash paid by check in United States dollars mailed directly
to the  shareholders  of record  (or if the  shares  are held in street or other
nominee  name,  then to the nominee) by the  custodian,  as dividend  disbursing
agent.

      The Plan Agent serves as agent for the shareholders in  administering  the
Plan.  After the Trust  declares a dividend or determines to make a capital gain
distribution,  the Plan Agent will, as agent for the  participants,  receive the
cash  payment and use it to buy Trust  shares in the open market on the New York
Stock Exchange for  the  participants' accounts. The Trust will not issue shares
under the Plan.

      Participants in the Plan may withdraw from the Plan upon written notice to
the Plan Agent and will receive  certificates  for whole Trust shares and a cash
payment for any fraction of a Trust share.

      The Plan Agent's fees for the  handling of the  reinvestment  of dividends
and distributions will be paid by the Trust.  However, each participant will pay
a pro rata share of  brokerage  commissions  incurred  with  respect to the Plan
Agent's open market  purchases in connection with the  reinvestment of dividends
and  distributions.  The automatic  reinvestment of dividends and  distributions
will not relieve  participants  of any federal income tax that may be payable on
such dividends or distributions.

      Experience  under  the Plan  may  indicate  that  changes  are  desirable.
Accordingly,  the Trust  reserves  the right to amend or  terminate  the Plan as
applied to any dividend or distribution paid subsequent to written notice of the
change sent to all  shareholders of the Trust at least 90 days before the record
date  for the  dividend  or  distribution.  The  Plan  also  may be  amended  or
terminated  by the Plan  Agent  upon at least 90  days'  written  notice  to all
shareholders  of the Trust.  All  correspondence  concerning  the Plan should be
directed  to the Plan Agent at (800)  699-1BFM.  The  address is on the front of
this report.

- --------------------------------------------------------------------------------
                             ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

      There have been no material changes in the Trust's  investment  objectives
or policies that have not been approved by the shareholders.  There have been no
changes in the  Trust's  charter or  by-laws.  There have been no changes in the
principal risk factors  associated with investment in the Trust. There have been
no changes in the  persons  who are  primarily  responsible  for the  day-to-day
management of the Trust's portfolio.


                                       15
<PAGE>


- --------------------------------------------------------------------------------
               THE BLACKROCK INSUREDMUNICIPAL 2008 TERM TRUST INC.
                                    GLOSSARY
- --------------------------------------------------------------------------------

CLOSED-END FUND:

Investment vehicle which initially offers a fixed number of shares and trades on
a stock  exchange.  The fund invests in a portfolio of  securities in accordance
with its stated investment objectives and policies.
                                                                                
                         
DISCOUNT:

When a fund's net asset  value is greater  than its stock price the fund is said
to be trading at a discount.
                         
DIVIDEND:

Income  generated by securities in a portfolio and  distributed to  shareholders
after the  deduction of  expenses.  This Trust  declares  and pays  dividends to
common shareholders on a monthly basis.

DIVIDEND REINVESTMENT:

Shareholders  may  have  all  dividends  and   distributions  of  capital  gains
automatically reinvested into additional shares of a fund.

EMBEDDED CAP BONDS:

Also known as additional interest municipal bonds. These securities are intended
to  protect  the income  that a fund earns  through  leverage  from  significant
increases in short-term  rates. The coupon on these bonds will increase if short
term rates rise significantly.

MARKET PRICE:

Price per share of a security trading in the secondary market.  For a closed-end
fund,  this is the  price at which  one  share of the fund  trades  on the stock
exchange. If you were to buy or sell shares, you would pay or receive the market
price.

NET ASSET VALUE (NAV):

Net asset value is the total  market  value of all  securities  and other assets
held by the Trust, plus income accrued on its investments, minus any liabilities
including accrued expenses,  divided by the total number of outstanding  shares.
It is the underlying value of a single share on a given day. Net asset value for
the Trust is calculated  weekly and published in Barron's and The New York Times
on Saturday or The Wall Street Journal each Monday.

PREMIUM:

When a fund's stock price is greater than its net asset value,  the fund is said
to be trading at a premium.
                         

PREREFUNDED BONDS:

These securities are collateralized by U.S. Government securities which are held
in escrow and are used to pay principal and interest on the tax exempt issue and
retire the bond in full at the date indicated, typically at a premium to par.

                                       16
<PAGE>

- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                               INVESTMENT SUMMARY
- --------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE:

The  Trust's  investment  objective  is to provide  current  income  exempt from
regular  federal  income  tax and to return $15 per share  (the  initial  public
offering price per share) to investors on or about December 31, 2008.

WHO MANAGES THE TRUST?

BlackRock  Financial  Management,   Inc.  (BlackRock  or  the  Adviser)  is  the
investment adviser for the Trust.  BlackRock is a registered  investment adviser
specializing  in  fixed  income   securities.   Currently,   BlackRock   manages
approximately $55 billion of assets across the government,  mortgage,  corporate
and municipal  sectors.  These assets are managed on behalf of institutional and
individual  investors in 21 closed-end  funds traded on the New York or American
Stock Exchanges,  several open-end funds and separate accounts for more than 125
clients  in the U.S.  and  overseas.  BlackRock  is a  subsidiary  of PNC  Asset
Management  Group,  Inc.  which is a  division  of PNC  Bank,  N.A.,  one of the
nation's largest banking organizations.

WHAT CAN THE TRUST INVEST IN?

The Trust  intends to invest at least 80% of its total  assets in a  diversified
portfolio  of  municipal  obligations  insured as to the timely  payment of both
principal  and  interest.  The Trust may invest up to 20% of its total assets in
uninsured municipal obligations which are rated Aaa by Moody's or AAA by S&P, or
are  determined  by the  Trust's  Adviser  to be of  comparable  credit  quality
(guaranteed, escrowed or backed in trust).

WHAT IS THE ADVISER'S INVESTMENT STRATEGY?

The Adviser will seek to meet the Trust's  investment  objective by managing the
assets of the Trust so as to return the initial  offering  price ($15 per share)
at maturity.  The Trust will implement a conservative strategy that will seek to
closely match the maturity of the assets of the portfolio with the future return
of the  initial  investment  at the end of  2008.  At the  Trust's  termination,
BlackRock expects that the value of the securities which have matured,  combined
with the value of the  securities  that are sold,  if any, will be sufficient to
return the initial offering price to investors. On a continuous basis, the Trust
will  seek its  objective  by  actively  managing  its  portfolio  of  municipal
obligations  which will have an average final  maturity on or about December 31,
2008 and by annually retaining a small portion of its income.

In addition to seeking the return of the  initial  offering  price,  the Adviser
also seeks to provide  current income exempt from regular  federal income tax to
investors.  The  portfolio  managers  will attempt to achieve this  objective by
investing in securities that provide competitive  income. In addition,  leverage
will be used (in an amount up to 35% of the total  assets) to enhance the income
of the  portfolio.  In  order  to  maintain  competitive  yields  as  the  Trust
approaches maturity and depending on market conditions, the Adviser will attempt
to  purchase  securities  with call  protection  or  maturities  as close to the
Trust's  maturity  date as  possible.  Securities  with call  protection  should
provide the portfolio with some degree of protection  against  reinvestment risk
during times of lower prevailing  interest rates. Since the Trust's primary goal
is to return the initial  offering  price at  maturity,  any cash that the Trust
receives  prior to its  maturity  date will be  reinvested  in  securities  with
maturities  which coincide with the remaining term of the Trust. It is important
to note that the Trust will be managed so as to preserve  the  integrity  of the
return of the initial  offering  price. If market  conditions,  such as interest
rate volatility, force a choice between current income and risking the return of
the initial  offering  price,  it is likely the return of the  initial  offering
price will be emphasized.

HOW ARE THE TRUST'S  SHARES  PURCHASED  AND SOLD?  DOES THE TRUST PAY  DIVIDENDS
REGULARLY?

The  Trust's  shares are traded on the New York Stock  Exchange  which  provides
investors with  liquidity on a daily basis.  Orders to buy or sell shares of the
Trust must be placed through a registered broker or financial advisor. The Trust
pays monthly  dividends which are typically paid on the last business day of the
month. For shares held in the shareholder's name, dividends may be reinvested in
additional  shares of the fund through the Trust's transfer agent,  State Street
Bank and Trust Company. Investors who wish to hold shares in a brokerage account
should check with their financial  advisor to determine  whether their brokerage
firm offers dividend reinvestment services.


                                       17
<PAGE>

LEVERAGE CONSIDERATIONS IN A TERM TRUST

Under current  market  conditions,  leverage  increases the income earned by the
Trust.  The Trust employs leverage  primarily  through the issuance of preferred
stock.  Leverage  permits  the Trust to  borrow  money at  short-term  rates and
reinvest that money in longer-term  assets which typically offer higher interest
rates.  The  difference  between the cost of the  borrowed  funds and the income
earned on the proceeds that are invested in longer term assets is the benefit to
the Trust from  leverage.  In general,  the portfolio is typically  leveraged at
approximately 35% of total assets.

Leverage also increases the duration (or price  volatility of the net assets) of
the Trust,  which can improve the  performance  of the fund in a declining  rate
environment,  but can cause net  assets to decline  faster  than the market in a
rapidly rising rate environment.  BlackRock's  portfolio  managers  continuously
monitor and  regularly  review the  Trust's  use of  leverage  and the Trust may
reduce,  or unwind,  the amount of leverage  employed should BlackRock  consider
that reduction to be in the best interests of the shareholders.

SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO TERM TRUSTS

THE TRUST IS  INTENDED  TO BE A  LONG-TERM  INVESTMENT  AND IS NOT A  SHORT-TERM
TRADING VEHICLE.

RETURN OF INITIAL  INVESTMENT.  Although the objective of the Trust is to return
its initial offering price upon termination, there can be no assurance that this
objective will be achieved.

DIVIDEND CONSIDERATION. The income and dividends paid by the Trust are likely to
decline  to some  extent  over  the  term of the  Trust  due to the  anticipated
shortening of the dollar-weighted average maturity of the Trust's assets.

LEVERAGE.  The Trust utilizes  leverage through the issuance of preferred stock,
which involves  special risks.  The Trust's net asset value and market value may
be more volatile due to its use of leverage.

MARKET PRICE OF SHARES.  The shares of closed-end  investment  companies such as
the Trust trade on the New York Stock  Exchange  (NYSE symbol:  BRM) and as such
are subject to supply and demand influences.  As a result, shares may trade at a
discount or a premium to their net asset value.

ILLIQUID  SECURITIES.  The Trust may  invest in  securities  that are  illiquid,
although  under current  market  conditions the Trust expects only to do so to a
limited extent. An investment in these securities involves special risks.

ANTITAKEOVER  PROVISIONS.  Certain antitakeover provisions will make a change in
the Trust's  business or management  more difficult  without the approval of the
Trust's Board of Directors and may have the effect of depriving  shareholders of
an  opportunity  to sell their shares at a premium above the  prevailing  market
price.

MUNICIPAL OBLIGATIONS.  Municipal obligations include debt obligations issued by
states,  cities, and local authorities,  and possessions and certain territories
of the United States to obtain funds for various public purposes,  including the
construction of public  facilities,  the refinancing of outstanding  obligations
and the obtaining of funds for general operating expenses and for loans to other
public  institutions  and  facilities.  The value of municipal  debt  securities
generally  varies  inversely with changes in prevailing  market  interest rates.
Depending  on the amount of call  protection  that the  securities  in the Trust
have, the Trust may be subject to certain  reinvestment risks in environments of
declining interest rates.

ALTERNATIVE  MINIMUM TAX (AMT).  The Trust may invest in  securities  subject to
AMT. The Trust currently holds no securities that are subject to AMT.


                                       18
<PAGE>


- --------------------------------------------------------------------------------
                      BLACKROCK FINANCIAL MANAGEMENT, INC.
                           SUMMARY OF CLOSED-END FUNDS
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

TAXABLE TRUSTS

- --------------------------------------------------------------------------------
                                                                                             STOCK       MATURITY
PERPETUAL TRUSTS                                                                             SYMBOL        DATE
                                                                                             ------       ------
<S>                                                                                           <C>           <C>
The BlackRock Income Trust Inc. ...........................................................   BKT           N/A
The BlackRock North American Government Income Trust Inc. .................................   BNA           N/A

TERM TRUSTS

The BlackRock 1998 Term Trust Inc. ........................................................   BBT          12/98
The BlackRock 1999 Term Trust Inc. ........................................................   BNN          12/99
The BlackRock Target Term Trust Inc. ......................................................   BTT          12/00
The BlackRock 2001 Term Trust Inc. ........................................................   BLK          06/01
The BlackRock Strategic Term Trust Inc. ...................................................   BGT          12/02
The BlackRock Investment Quality Term Trust Inc. ..........................................   BQT          12/04
The BlackRock Advantage Term Trust Inc. ...................................................   BAT          12/05
The BlackRock Broad Investment Grade 2009 Term Trust Inc. .................................   BCT          12/09


TAX-EXEMPT TRUSTS

- ---------------------------------------------------------------------------------------------------------------------------

                                                                                             STOCK       MATURITY
PERPETUAL TRUSTS                                                                             SYMBOL        DATE
                                                                                             ------       ------
The BlackRock Investment Quality Municipal Trust Inc. .....................................   BKN           N/A
The BlackRock California Investment Quality Municipal Trust Inc. ..........................   RAA           N/A
The BlackRock Florida Investment Quality Municipal Trust ..................................   RFA           N/A
The BlackRock New Jersey Investment Quality Municipal Trust Inc. ..........................   RNJ           N/A
The BlackRock New York Investment Quality Municipal Trust Inc. ............................   RNY           N/A

TERM TRUSTS

The BlackRock Municipal Target Term Trust Inc. ............................................   BMN          12/06
The BlackRock Insured Municipal 2008 Term Trust Inc. ......................................   BRM          12/08
The BlackRock California Insured Municipal 2008 Term Trust Inc. ...........................   BFC          12/08
The BlackRock Florida Insured Municipal 2008 Term Trust ...................................   BRF          12/08
The BlackRock New York Insured Municipal 2008 Term Trust Inc. .............................   BLN          12/08
The BlackRock Insured Municipal Term Trust Inc. ...........................................   BMT          12/10
</TABLE>

 IF YOU WOULD LIKE FURTHER INFORMATION PLEASE CALL BLACKROCK AT (800) 227-7BFM
                 (7236) OR CONSULT WITH YOUR FINANCIAL ADVISOR.


<PAGE>

BLACKROCK

DIRECTORS
Laurence D. Fink, Chairman
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Grosfeld
James Clayburn La Force, Jr.
Walter F. Mondale
Ralph L. Schlosstein

OFFICERS
Ralph L. Schlosstein, PRESIDENT
Keith T. Anderson, VICE PRESIDENT
Michael C. Huebsch, VICE PRESIDENT
Robert S. Kapito, VICE PRESIDENT
Kevin Klingert, VICE PRESIDENT
Richard M. Shea, VICE PRESIDENT/TAX
Henry Gabbay, TREASURER
James Kong, ASSISTANT TREASURER
Karen H. Sabath, SECRETARY

INVESTMENT ADVISER
BlackRock Financial Management, Inc.
345 Park Avenue
New York, NY 10154
(800) 227-7BFM

ADMINISTRATOR
Princeton Administrators, L.P.
P.O. Box 9095
Princeton, NJ 08543-9095
(800) 688-0928

CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
One Heritage Drive
North Quincy, MA 02171
(800) 699-1BFM

AUCTION AGENT
Bankers Trust Company
4 Albany Street
New York, NY 10006

INDEPENDENT AUDITORS
Deloitte & Touche LLP
Two World Financial Center
New York, NY 10281-1434

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom LLP
919 Third Avenue
New York, NY 10022

   This report is for shareholder information. This is not a prospectus intended
for use in the purchase or sale of any securities.

                              THE BLACKROCK INSURED
                         MUNICIPAL 2008 TERM TRUST INC.
                       c/o Princeton Administrators, L.P.
                                  P.O. Box 9095
                            Princeton, NJ 08543-9095
                                 (800) 227-7BFM

                                                                     09247K 10 9
                                                                     09247K 30 7
                                                                     09247K 20 8
                                                                     09247K 40 6
                                                                     09247K 50 5
(LOGO) Printed on recycled paper

The BLACKROCK
Insured Municipal 2008 Term
Trust Inc.
================================
Annual Report
December 31, 1997





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