BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC
N-30D, 1998-08-27
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- --------------------------------------------------------------------------------
               THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- --------------------------------------------------------------------------------

                                                                   July 31, 1998

Dear Shareholder:

      Domestic  bonds  provided  investors  with modest total returns during the
past six months,  as interest rates generally  fell.  Supporting the bond market
was favorable inflation news and the belief that the Federal Reserve is unlikely
to raise short-term interest rates in the immediate future.

      U.S.  economic  growth has slowed of late after a robust first  quarter of
1998.  We  expect  the  fallout  from the  Asian  fiscal  crisis  to  quash  any
significant  rebound in U.S.  growth  for the  remainder  of the year.  While we
expect  that  interest  rates  will  be  fairly  stable  in the  near-term,  our
longer-term  outlook  for the  bond  market  remains  optimistic,  based  on the
fundamentally  favorable  backdrop of low  inflation,  a currently high level of
real yields, and declining Treasury borrowing.

      As you may know, the five investment  management  firms that comprised the
PNC Asset  Management  Group have  consolidated  under  BlackRock,  resulting in
BlackRock Inc., a $119 billion money  management  firm. 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  comments from your Trust's  managers  regarding the
markets and  portfolio  in addition to the Trust's  financial  statements  and a
detailed  portfolio listing.  We thank you for your continued  investment in the
Trust.

Sincerely,

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

                                       1

<PAGE>

                                                                   July 31, 1998

Dear Shareholder:

      We are pleased to present the semi-annual report for The BlackRock Insured
Municipal  2008 Term Trust Inc.  ("the Trust") for the six months ended June 30,
1998. 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 period:

                            ----------------------------------------------------
                            6/30/98    12/31/97   CHANGE     HIGH        LOW
- --------------------------------------------------------------------------------
STOCK PRICE                 $15.5000   $15.2500    1.64%    $15.7500   $14.8750
- --------------------------------------------------------------------------------
NET ASSET VALUE (NAV)       $16.76     $16.80     (0.24%)   $17.03     $16.54
- --------------------------------------------------------------------------------

THE FIXED INCOME MARKETS

      After an extremely  strong first  quarter of 1998,  U.S.  economic  growth
slowed during the past three months.  Despite the strong  economic growth of the
past year,  inflation  stayed  surprisingly  subdued.  One  explanation  for the
absence of inflation in the U.S.  economy  stems from the aftermath of the Asian
financial  crisis.  U.S. exports to Asia have slowed,  while the strength of the
dollar  caused cheap Asian imports to flood the U.S.  market and exert  downward
price pressure on domestic goods.

      Yields of U.S. Treasury  securities have remained in a fairly narrow range
during the period.  For example,  the yield of the 10-Year Treasury posted a net
decline of 29 basis points (0.29%),  beginning 1998 at 5.74% and closing on June
30, 1998 at 5.45%.  The past six months  represented  a  continuation  of strong
Treasury  performance,  which has been due to moderating  economic  growth,  low
inflation and a "flight to quality" from investors  seeking a safe haven in U.S.
Treasury  securities.  Continued  expectations  that the Asian  crisis will slow
economic  growth and force the Fed to leave the  Federal  funds  rate  unchanged
provided  additional support to the bond market. With Treasury supply waning due
to a  surplus  in  the  federal  budget  and an  increased  foreign  demand  for
Treasuries  due to their  U.S.  government  backing  and  relatively  attractive
yields,  we anticipate a positive  environment for Treasuries for the balance of
1998.

      Municipal bonds underperformed the taxable domestic bond market during the
past six months,  returning 2.69% (as measured by the LEHMAN BROTHERS  MUNICIPAL
INDEX) versus the LEHMAN  BROTHERS  AGGREGATE  INDEX'S 3.91% on a pre-tax basis.
The main forces behind municipal bond  underperformance were increased municipal
bond supply (fueled by the

                                       2

<PAGE>


lowest  municipal  interest rates since the 1960s) and retail  investor focus on
the equity markets.  We believe that municipals are  attractively  valued versus
Treasuries  and our outlook for municipal  securities  is favorable.  The credit
quality  of most  issuers  remains  strong,  and we expect  that the  attractive
taxable equivalent yields offered by municipal securities should bring investors
back into the market.

THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY

      The Trust's portfolio is actively managed to diversify exposure to 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.  Additionally,  the  Trust  emphasizes  securities  whose
maturity  dates match the  termination  date of the Trust.  We have continued to
minimize trading  activity in the Trust during the period,  as the market prices
of a significant portion of the portfolio's bonds are currently above the prices
at which  they  were  bought.  A bond sold at a gain  would  result in the Trust
realizing  a  capital  gain,  which  may  require  a  taxable   distribution  to
shareholders.  Since one of the Trust's primary investment  objectives is to pay
out tax-exempt income, we believe that waiting to restructure the portfolio in a
higher interest rate environment remains the most prudent strategy.

      The  following  chart  compares the Trust's  current and December 31, 1997
asset composition:

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

              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.

- --------------------------------------------------------------------------------
          SECTOR                   JUNE 30, 1998  DECEMBER 31, 1997
- --------------------------------------------------------------------------------
          County, City & State           26%            25%
- --------------------------------------------------------------------------------
          Utility/Power                  22%            22%
- --------------------------------------------------------------------------------
          Hospital                       14%            15%
- --------------------------------------------------------------------------------
          Transportation                  7%             6%
- --------------------------------------------------------------------------------
          Water & Sewer                   6%             6%
- --------------------------------------------------------------------------------
          Lease Revenue                   6%             6%
- --------------------------------------------------------------------------------
          Education                       6%             6%
- --------------------------------------------------------------------------------
          Tax Revenue                     6%             6%
- --------------------------------------------------------------------------------
          Other                           4%             5%
- --------------------------------------------------------------------------------
          Housing                         3%             3%
- --------------------------------------------------------------------------------

      Additionally,  the Trust employs  leverage to enhance its income by paying
the Trust's preferred shareholders  short-term municipal rates and investing the
proceeds in longer maturity issues which have higher yields. The Trust's ability
to pay high monthly income may be affected by the profitability of its leverage.
The  Federal  Reserve's  neutral  interest  rate  policy has allowed the Trust's
leverage costs to remain  reasonable.  At the present,  we believe that leverage
will continue to positively  contribute to the Trust's  long-term income earning
ability.

                                       3

<PAGE>


      We look forward to managing  the Trust to benefit  from the  opportunities
available in the fixed income markets and to meet its investment objectives.  We
thank you for your investment in the BlackRock Insured Municipal 2008 Term Trust
Inc.  Please feel free to contact our marketing  center at (800) 227-7BFM (7236)
if you  have  specific  questions  which  were  not  addressed  in this  report.

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 6/30/98:                             $15.50
- --------------------------------------------------------------------------------
   Net Asset Value as of 6/30/98:                                 $16.76
- --------------------------------------------------------------------------------
   Yield on Closing Stock Price as of 6/30/98: ($15.50)1            5.13%
- --------------------------------------------------------------------------------
   Current Monthly Distribution per Common Share2:                 $0.06625
- --------------------------------------------------------------------------------
   Current Annualized Distribution per Common Share2:              $0.795
- --------------------------------------------------------------------------------

- ----------
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 JUNE 30, 1998 (UNAUDITED)
- ----------------------------------------------------------------------------------------------------------------
       PRINCIPAL                                                                   OPTION
        AMOUNT                                                                       CALL               VALUE
RATING* (000)                       DESCRIPTION                                   PROVISIONS++           (NOTE 1)
- ----------------------------------------------------------------------------------------------------------------
               LONG-TERM INVESTMENTS -- 143.7%
               ALABAMA -- 0.2%
<S>  <C>                                                                       <C>                  <C>         
AAA  $ 1,905   Mobile Impvt. Wt., Zero Coupon, 8/15/08, MBIA ...............   08/02 at 71.587      $  1,136,218
                                                                                                    ------------
               ARIZONA -- 0.6%
AAA    4,000   Chandler, G.O., Zero Coupon, 7/01/08, FGIC ..................      No Opt. Call         2,534,920
                                                                                                    ------------
               CALIFORNIA -- 0.4%
AAA    1,890   California Hlth. Fac. Fin. Auth. Rev., Marin Gen. Hosp., 
                 Ser. A, 5.75%, 8/01/09, FSA ...............................      08/03 at 102         2,014,853
                                                                                                    ------------
               COLORADO -- 10.7%
AAA    2,000   E-470 Pub. Hwy. Auth. Co. Rev., Ser. B, Zero Coupon, 
                 9/01/11, MBIA .............................................      No Opt. Call         1,063,720
AAA   30,205   Jefferson Cnty., Sch. Dist. No. R-001, G.O., 
                 6.25%, 12/15/02+, AMBAC ...................................               N/A        33,107,398
AAA   13,285   Univ. of Colorado, Hosp. Auth. Rev., Ser. A, 
                 6.25%, 11/15/02, AMBAC ....................................               N/A        14,652,956
                                                                                                    ------------
                                                                                                      48,824,074
                                                                                                    ------------
               DISTRICT OF COLUMBIA -- 5.4%
               Dist. of Columbia, G.O., MBIA,
AAA   17,950     Ser. B, 6.30%, 6/01/09 ....................................      06/02 at 102        19,429,080
AAA    3,070     Ser. E, 5.875%, 6/01/08 ...................................      06/03 at 102         3,282,383
AAA    2,000   Dist. of Columbia, Hosp. Rev., Children's Hosp., Ser. A, 
                 6.25%, 7/15/08, FGIC ......................................      07/02 at 102         2,159,220
                                                                                                    ------------
                                                                                                      24,870,683
                                                                                                    ------------
               GEORGIA -- 1.7%
               Atlanta, C.O.P., Pretrial Det. Ctr., MBIA,
AAA    3,000     6.25%, 12/01/08 ...........................................      12/02 at 102         3,269,370
AAA    4,000     6.25%, 12/01/11 ...........................................      12/02 at 102         4,359,160
                                                                                                    ------------
                                                                                                       7,628,530
                                                                                                    ------------
               HAWAII -- 1.9%
AAA    7,760   Honolulu, Cnty., G.O., Ser. A, 5.80%, 1/01/07, FGIC .........      No Opt. Call         8,472,446
                                                                                                    ------------
               ILLINOIS -- 13.2%
AAA   14,205   Chicago O'Hare Intl. Arprt. Rev., G.O., Ser. A, 
                 6.25%, 1/01/08, MBIA ......................................      01/05 at 102        15,700,218
               Chicago, Sch. Fin. Auth., G.O., Ser. A, FGIC,
AAA   13,000     6.25%, 6/01/07 ............................................      06/02 at 102        14,004,380
AAA    9,150     6.25%, 6/01/09 ............................................      06/02 at 102         9,856,929
               Illinois Hlth. Fac. Auth. Rev.,
AAA   11,000     Alexian Med. Ctr. Proj., Ser. A, 6.35%, 1/01/08, MBIA .....      01/02 at 102        11,749,430
AAA    2,500     Carle Foundation, Ser. A, 6.75%, 1/01/10, FGIC ............      01/00 at 102         2,635,275
AAA   10,170   Met. Pier & Expo. Auth., Ded. St. Tax Rev., 
                 Ser. A, Zero Coupon, 6/15/08, FGIC ........................      No Opt. Call         6,414,219
                                                                                                    ------------
                                                                                                      60,360,451
                                                                                                    ------------
               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         6,107,097
AAA    4,350     Ser. B, 6.25%, 7/01/08 ....................................      07/02 at 102         4,689,474
                                                                                                    ------------
                                                                                                      10,796,571
                                                                                                    ------------
               IOWA -- 1.3%
AAA    1,725   Iowa Fin. Auth., Sngl. Fam. Mtge. Rev., Ser. F,
                 6.35%, 7/01/09, AMBAC .....................................      01/03 at 102         1,827,258
AAA    4,195   Muscatine, Elec. Rev., 5.00%, 1/01/08, FSA ..................      01/99 at 100         4,204,481
                                                                                                    ------------
                                                                                                       6,031,739
                                                                                                    ------------
               KENTUCKY -- 0.5%
AAA    3,890   Owensboro, Elec. Lt. & Pwr. Rev., Ser. B, Zero Coupon, 
                 1/01/09, AMBAC ............................................      No Opt. Call         2,399,780
                                                                                                    ------------

</TABLE>

                                       See Notes to Financial Statements.

                                                       5

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------
       PRINCIPAL                                                                   OPTION
        AMOUNT                                                                       CALL               VALUE
RATING* (000)                       DESCRIPTION                                   PROVISIONS++         (NOTE 1)
- ----------------------------------------------------------------------------------------------------------------
               LOUISIANA -- 1.2%
<S>  <C>                                                                       <C>                  <C>         
AAA  $ 5,000   Louisiana Pub. Fac. Auth. Hosp. Rev., Lafayette Gen. 
                 Med. Ctr. Proj. 6.30%, 10/01/08, FSA ......................      10/02 at 102      $  5,454,200
                                                                                                    ------------
               MASSACHUSETTS -- 4.8%
AAA    4,465   Chelsea, Sch. Proj. Loan, 6.00%, 6/15/04, AMBAC .............               N/A         4,953,337
AAA    6,000   Massachusetts Bay Trans. Auth. Rev., Ser. B,
                 6.00%, 3/01/10, MBIA ......................................      03/03 at 102         6,440,040
AAA   10,000   Massachusetts St. Hsg. Fin. Agcy., Hsg. Proj., 
                 Ser. A, 5.95%, 10/01/08, AMBAC ............................      04/03 at 102        10,699,600
                                                                                                    ------------
                                                                                                      22,092,977
                                                                                                    ------------
               MICHIGAN -- 5.1%
               Lake Orion, Cmnty. Sch. Dist., AMBAC,
AAA    3,290     6.60%, 5/01/05 ............................................               N/A         3,778,532
AAA    3,285     6.70%, 5/01/05 ............................................               N/A         3,792,073
AAA    8,920   Michigan St. Bldg. Auth. Rev., Fac. Proj., Ser. IIA, 
                 6.25%, 10/01/08, AMBAC ....................................      10/02 at 102         9,680,608
AAA    1,760   Western Michigan Univ. Rev., 6.20%, 11/15/02, FGIC ..........               N/A         1,937,742
AAA    3,400   Wyandotte, Elec. Rev., 6.25%, 10/01/08, MBIA ................      No Opt. Call         3,873,212
                                                                                                    ------------
                                                                                                      23,062,167
                                                                                                    ------------
               MISSOURI -- 1.7%
AAA    7,350   Kansas City, Sch. Dist. Bldg. Corp. Leasehold Rev., Cap. 
                 Impvts. Proj., Ser. A, 6.50%, 2/01/08, FGIC ...............      02/01 at 102         7,870,821
                                                                                                    ------------
               NEVADA -- 3.9%
AAA    6,490   Clark Cnty., Fld. Ctrl., 6.30%, 11/01/01, AMBAC .............               N/A         6,995,636
               Washoe Cnty., Arpt. Auth., Ser. B, MBIA,
AAA    3,135     5.70%, 7/01/07 ............................................      07/03 at 102         3,346,174
AAA    2,645     5.75%, 7/01/08 ............................................      07/03 at 102         2,829,013
AAA    4,135   Washoe Cnty., Sch. Dist., G.O., Ser. A, 
                 6.20%, 10/01/02, AMBAC ....................................               N/A         4,500,658
                                                                                                    ------------
                                                                                                      17,671,481
                                                                                                    ------------
               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       32,762,697
AAA   24,495   New Jersey St. G.O., Ser. D, 6.00%, 2/15/09, MBIA ...........       02/03 at 102       26,439,903
                                                                                                    ------------
                                                                                                      59,202,600
                                                                                                    ------------
               NEW YORK -- 8.2%
               New York City G.O., Ser. E, MBIA,
AAA    5,000     6.125%, 8/01/06 ...........................................      No Opt. Call         5,534,700
AAA   15,500     6.20%, 8/01/07 ............................................      No Opt. Call        17,350,855
AAA    5,000     Ser. G, 5.75%, 2/01/08 ....................................   02/06 at 101.50         5,417,450
               New York St. Environ. Fac. Corp., P.C.R., Ser. D,
AAA    5,945     6.50%, 5/15/07 ............................................      11/04 at 102         6,755,898
AAA    2,245     6.50%, 11/15/07 ...........................................      11/04 at 102         2,551,218
                                                                                                    ------------
                                                                                                      37,610,121
                                                                                                    ------------
               NORTH CAROLINA -- 8.7%
AAA    1,000   Cumberland Cnty. C.O.P., Civic Ctr. Proj., Ser. A, 
                 6.375%, 12/01/09, AMBAC ...................................      12/04 at 102         1,121,800
               North Carolina Eastn. Mun. Pwr. Agcy. Rev., Ser. B,
AAA   14,675     7.25%, 1/01/07, CAPMAC ....................................      No Opt. Call        17,352,014
AAA    5,000     7.00%, 1/01/08, CAPMAC ....................................      No Opt. Call         5,890,900
AAA   13,500     6.125%, 1/01/09, FGIC .....................................      No Opt. Call        15,168,465
                                                                                                    ------------
                                                                                                      39,533,179
                                                                                                    ------------
               NORTH DAKOTA -- 1.1%
AAA    4,450   Bismark Hosp. Rev., St. Alexius Med. Ctr., 
                 6.90%, 5/01/06, AMBAC .....................................      05/03 at 102         4,819,038

</TABLE>

                                       See Notes to Financial Statements.

                                                       6

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------
       PRINCIPAL                                                                   OPTION
        AMOUNT                                                                       CALL               VALUE
RATING* (000)                       DESCRIPTION                                   PROVISIONS++         (NOTE 1)
- ----------------------------------------------------------------------------------------------------------------
               OHIO -- 2.3%
<S>  <C>                                                                       <C>                  <C>         
AAA  $ 2,410   Cleveland, G.O., 6.40%, 11/15/04 , MBIA .....................               N/A      $  2,740,001
AAA    6,095   Hamilton City, Elec. Sys. Rev., Ser. A, 6.125%, 
                 10/15/08, FGIC ............................................      10/02 at 102         6,601,190
AAA    1,000   Ohio St. Bldg. Auth., Fac. Rev., Juvenile Correctional Proj., 
                 6.50%, 10/01/09, AMBAC ....................................      09/04 at 102         1,127,940
                                                                                                    ------------
                                                                                                      10,469,131
                                                                                                    ------------
               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         4,328,160
               Dauphin Cnty. Gen. Auth. Hosp. Rev., HAPSCO-Western  
                 PennsylvaniA Hosp. Proj., MBIA,
AAA   10,000     6.25%, Ser. A, 7/01/08 ....................................      07/02 at 102        10,780,400
AAA    5,000     6.25%, 7/01/08 ............................................      07/02 at 102         5,390,200
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         7,115,064
AAA    3,500   Indiana Cnty. Indl. Dev. Auth., P.C.R., New York St. 
                 Elec. & Gas Corp., Ser. A, 6.00%, 6/01/06, MBIA ...........      No Opt. Call         3,858,470
AAA    6,500   Pennsylvania Hsg. Fin. Agcy. Rev., Rental Hsg., 
                 Ser. C, 6.25%, 7/01/07, FNMA ..............................      07/02 at 102         6,918,925
AAA    7,450   Pennsylvania St., G.O., Ser. A, 6.50%, 11/01/01, FGIC .......      No Opt. Call         8,108,878
AAA   10,930   Pittsburgh, G.O., Ser. D, 6.00%, 9/01/08, AMBAC .............      09/02 at 102        11,759,478
AAA    1,665   Scranton-Lackawanna Hlth. & Welfare Auth. Rev., 
                 6.90%, 1/01/00, MBIA ......................................               N/A         1,767,364
                                                                                                    ------------
                                                                                                      60,026,939
                                                                                                    ------------
               TEXAS -- 24.5%
AAA   13,000   Austin, Pub. Impvt., G.O., AMBAC, 6.10%, 9/01/02 ............               N/A        13,972,400
               Austin, Util. Sys. Rev.,
AAA   11,515     Ser. A, Zero Coupon, 11/15/08, MBIA .......................      No Opt. Call         7,138,379
AAA    5,000     Ser. A, Zero Coupon, 11/15/09, AMBAC ......................      No Opt. Call         2,927,300
AAA    5,000     Ser. A, Zero Coupon, 11/15/09, MBIA .......................      No Opt. Call         2,927,300
AAA    5,000     6.625%, 11/15/08, AMBAC ...................................      No Opt. Call         5,838,250
AAA    7,000     6.25%, 11/15/08, AMBAC ....................................      11/02 at 102         7,632,590
AAA    5,225   Baytown, G.O., 6.40%, 2/01/08, AMBAC ........................      02/02 at 100         5,562,953
AAA    9,930   Circle C Mun. Util. Dist. No. 3 Rev., 6.50%, 11/15/09, FGIC .      11/01 at 100        10,618,447
               Coppell Indpt. Sch. Dist., MBIA,
AAA    1,430     6.10%, 8/15/09 ............................................      No Opt. Call         1,610,409
AAA    2,495     6.10%, 8/15/09 ............................................      08/02 at 100         2,637,065
AAA    4,390   Houston Indpt. Sch. Dist., Zero Coupon, 8/15/09, AMBAC ......      No Opt. Call         2,600,592
AAA   16,135   Houston, Wtr. & Swr. Sys. Rev., Jr. Lien, Ser. C, 
                 6.25%, 12/01/09, MBIA .....................................      12/02 at 102        17,651,851
AAA    6,000   San Antonio Elec. & Gas Rev., Ser. B, Zero Coupon, 
                 2/01/10, FGIC .............................................      No Opt. Call         3,438,900
               Texas Mun. Pwr. Agcy. Rev., AMBAC,
AAA   15,000     Zero Coupon, 9/01/08 ......................................      No Opt. Call         9,387,150
AAA   16,175     Zero Coupon, 9/01/09 ......................................      No Opt. Call         9,561,851
AAA    5,900   Texas St. Pub. Fin. Auth. Bldg. Rev., Ser. B, 
                 6.25%, 2/01/09, AMBAC .....................................      No Opt. Call         6,747,948
AAA    2,275   Ysleta, Indpt. Sch. Dist. Rev., Zero Coupon, 8/15/08, PSFG ..      No Opt. Call         1,428,063
                                                                                                    ------------
                                                                                                     111,681,448
                                                                                                    ------------
               UTAH -- 1.2%
AAA    3,500   Intermountain Pwr. Agcy. Rev., Ser. B, 6.00%, 
                 7/01/07, MBIA .............................................      No Opt. Call         3,877,405
AAA    1,550   Salt Lake Cnty. Mun. Bldg. Auth. Lease Rev., Ser. A, 
                 6.05%, 10/01/08, MBIA .....................................      10/04 at 101         1,684,649
                                                                                                    ------------
                                                                                                       5,562,054
                                                                                                    ------------
               WASHINGTON -- 13.8%
AAA   12,850   King Cnty., Ser. D, 5.55%, 12/01/08, MBIA ...................      12/07 at 102        13,955,486
AAA    9,000   Seattle Hlth Care Fac. Auth. Rev., Virginia Mason Oblig. 
                 Group, 6.30%, 2/15/09, MBIA ...............................      02/03 at 102         9,782,640
               Snohomish Cnty., Sch. Dist., MBIA
AAA    2,235     6.10%, 12/01/03+ ..........................................               N/A         2,473,944
AAA    1,765     6.10%, 12/01/08+ ..........................................      12/03 at 102         1,920,108
               Washington St. Pub. Pwr. Supply Sys. Rev.,
AAA    5,550     No. 3, Zero Coupon, 7/01/07, BIG ..........................      No Opt. Call         3,664,998
AAA    2,000     No. 3, Zero Coupon, 7/01/08, BIG ..........................      No Opt. Call         1,256,340
AAA    3,000     5.55%, 7/01/10, FGIC ......................................      07/03 at 102         3,130,110
AAA   11,000     5.80%, 7/01/07, FSA .......................................      No Opt. Call        11,965,690
AAA   13,635     No. 2, Ser. A, 6.25%, 7/01/09, MBIA .......................      07/02 at 102        14,699,075
                                                                                                    ------------
                                                                                                      62,848,391
                                                                                                    ------------

</TABLE>

                                       See Notes to Financial Statements.

                                                       7
<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------
       PRINCIPAL                                                                   OPTION
        AMOUNT                                                                       CALL               VALUE
RATING* (000)                       DESCRIPTION                                   PROVISIONS++         (NOTE 1)
- ----------------------------------------------------------------------------------------------------------------
               WEST VIRGINIA -- 2.7%
<S>  <C>                                                                       <C>                  <C>         
AAA  $11,600   West Virginia St. Parkways Econ. Dev. & Tourism Auth., 
                 5.70%, 5/15/09, FGIC ......................................      05/03 at 102      $ 12,292,984
                                                                                                    ------------
               TOTAL LONG-TERM INVESTMENTS (COST $593,238,221) .............                         655,267,796
                                                                                                    ------------

               SHORT-TERM INVESTMENTS** -- 0.5%
               CONNECTICUT -- 0.1%
A1+      300   Connecticut St. Dev. Auth. P.C.R., Western Mass. Elec. Co.,
                 Ser. A, 3.30%, 7/01/98, FRDD ..............................               N/A           300,000
               FLORIDA -- 0.2%
P1       700   Hillsborough Cnty. Indl. Dev. Auth., P.C.R., Tampa Elec. Co., 
                 4.10%, 7/01/98, FRDD ......................................               N/A           700,000
               GEORGIA -- 0.0%
A1+      200   Burke Cnty. Dev. Auth. P.C.R., Georgia Pwr. Co., 
                 4.10%, 7/01/98, FRDD ......................................               N/A           200,000
               MISSOURI -- 0.1%
A1+      400   Kansas City Indl. Dev. Auth., Hosp. Rev., 3.80%, 
                 7/01/98, FRDD .............................................               N/A           400,000
               NEW YORK -- 0.1%
P1       600   New York Res. & Dev. Auth. P.C.R., New York St. 
                 Elec. and Gas, 3.80%, 7/01/98, FRDD .......................               N/A           600,000
                                                                                                    ------------

               TOTAL SHORT-TERM INVESTMENTS (COST $2,200,000) ..............                           2,200,000
                                                                                                    ------------
               TOTAL INVESTMENTS -- 144.2% (COST $595,438,221) .............                         657,467,796
               Other assets in excess of liabilities -- 1.0% ...............                           4,486,344
               Liquidation value of preferred stock -- (45.2%) .............                        (206,000,000)
                                                                                                    ------------
               NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS -- 100 .........                        $455,954,140
                                                                                                    ============

</TABLE>

- ----------
*   Rating: Using the higher of Standard and Poor's, Moody's or Fitch's rating.

**  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.

++  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.

================================================================================
         THE FOLLOWING ABBREVIATIONS ARE USED IN PORTFOLIO DESCRIPTIONS:

<TABLE>
<CAPTION>

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

</TABLE>

================================================================================

                       See Notes to Financial Statements.

                                       8

<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK INSUREDMUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
ASSETS
Investments, at value (cost $595,438,221) (Note 1) .........      $ 657,467,796
Cash .......................................................             47,532
Interest receivable ........................................         10,113,731
Receivable from investments sold ...........................            220,000
Other Assets ...............................................             31,199
                                                                  -------------
                                                                    667,880,258
                                                                  -------------
LIABILITIES
Payable for investments purchased ..........................          5,216,500
Investment advisory fee payable (Note 2) ...................            191,095
Dividends payable--preferred stock .........................            169,915
Administration fee payable (Note 2) ........................             54,599
Other accrued expenses .....................................            294,009
                                                                  -------------
                                                                      5,926,118
                                                                  -------------
NET INVESTMENT ASSETS ......................................      $ 661,954,140
                                                                  =============
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 ......................         15,497,076
  Accumulated net realized loss ............................           (293,368
  Net unrealized appreciation ..............................         62,029,575
                                                                  -------------
  Net investment assets, June 30, 1998 .....................      $ 661,954,140
                                                                  =============
  Net assets applicable to commonshareholders ..............      $ 455,954,140
                                                                  =============
Net asset value per common share:
  ($455,954,140 O 27,207,093 shares of
  common stock issued and outstanding) .....................             $16.76
                                                                         ======

- --------------------------------------------------------------------------------
THE BLACKROCK INSUREDMUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
NET INVESTMENT INCOME
Income
  Interest and discount earned ...............................      $18,125,049
                                                                    -----------
Expenses
  Investment advisory ........................................        1,156,178
  Administration .............................................          330,336
  Auction agent ..............................................          298,000
  Custodian ..................................................           87,000
  Directors ..................................................           55,000
  Reports to shareholders ....................................           50,000
  Audit ......................................................           33,000
  Transfer agent .............................................           15,000
  Legal ......................................................           12,000
  Miscellaneous ..............................................           51,172
                                                                    -----------
     Total expenses ..........................................        2,087,686
                                                                    -----------
Net investment income ........................................       16,037,363
                                                                    -----------
UNREALIZED LOSS ON
  INVESTMENTS (NOTE 3)
  Net change in unrealized appreciationon investments ........       (3,001,035)
                                                                    -----------
NET INCREASE IN NET INVESTMENT
   ASSETS RESULTING FROM OPERATIONS ..........................      $13,036,328
                                                                    ===========

                       See Notes to Financial Statements.

                                       9

<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS (UNAUDITED)
- --------------------------------------------------------------------------------
                                                  SIX MONTHS       YEAR ENDED
                                                     ENDED         DECEMBER 31,
                                                 JUNE 30, 1998         1997
                                                 -------------    -------------
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
OPERATIONS:
  Net investment income ......................   $  16,037,363    $  31,973,585
  Net realized gain on investments ...........            --            172,902
  Net change in unrealized appreciation
    on investments ...........................      (3,001,035)      21,311,862
                                                 -------------    -------------
  Net increase in net investment assets
    resulting from operations ................      13,036,328       53,458,349
                                                 -------------    -------------
DIVIDENDS AND DISTRIBUTIONS:
  To common shareholders from net
    investment income ........................     (10,814,632)     (21,498,340)
  To common shareholders in excess of net
    realized gain on investments .............            --           (130,975)
  To preferred shareholders from net
    investment income ........................      (3,459,677)      (7,203,821)
  To preferred shareholders in excess of
    net realized gain on investments .........            --            (41,921)
                                                 -------------    -------------
  Total dividends and distributions ..........     (14,274,309)     (28,875,057)
                                                 -------------    -------------
       Total increase (decrease) .............      (1,237,981)      24,583,292
                                                 -------------    -------------
NET INVESTMENT ASSETS
Beginning of period ..........................     663,192,121      638,608,829
                                                 -------------    -------------
End of period ................................   $ 661,954,140    $ 663,192,121
                                                 =============    =============

                       See Notes to Financial Statements.

                                       10

<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
- -----------------------------------------------------------------------------------------------------------------------------------
                                                              SIX MONTHS
                                                                 ENDED                        YEAR ENDED DECEMBER 31,
                                                                JUNE 30,   --------------------------------------------------------
PER SHARE OPERATING PERFORMANCE:                                  1998        1997        1996        1995        1994        1993
                                                               --------    --------    --------    --------    --------    --------
<S>                                                            <C>         <C>         <C>         <C>         <C>         <C>     
Net asset value, beginning of the period ..................    $  16.80    $  15.90    $  16.08    $  13.88    $  16.23    $  14.31
                                                               --------    --------    --------    --------    --------    --------
  Net investment income ...................................        0.59        1.18        1.17        1.19        1.15        1.14
  Net realized and unrealized gain (loss)
    on investments ........................................       (0.11)       0.78       (0.27)       2.21       (2.39)       1.91
                                                               --------    --------    --------    --------    --------    --------
Net increase (decrease) from investment operations ........        0.48        1.96        0.90        3.40       (1.24)       3.05
                                                               --------    --------    --------    --------    --------    --------
Dividends from net investment income to:
  Preferred shareholders ..................................       (0.12)      (0.27)      (0.25)      (0.28)      (0.23)      (0.20)
  Common shareholders .....................................       (0.40)      (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 .........................       (0.52)      (1.06)      (1.08)      (1.20)      (1.11)      (1.13)
                                                               --------    --------    --------    --------    --------    --------
Net asset value, end of period* ...........................    $  16.76    $  16.80    $  15.90    $  16.08    $  13.88    $  16.23
                                                               ========    ========    ========    ========    ========    ========
Market value, end of period* ..............................    $  15.50    $  15.25    $  14.50    $  13.50    $  12.25    $  15.13
                                                               ========    ========    ========    ========    ========    ========
TOTAL INVESTMENT RETURN ...................................        4.28%      10.97%      13.56%      17.64%     (13.71)%     16.05%
                                                               ========    ========    ========    ========    ========    ========
RATIOS TO AVERAGE NET ASSETS OF
  COMMONSHAREHOLDERS:
Expenses ..................................................       0.92%+++    0.92%       0.95%       0.95%       1.02%       0.88%
Net investment income before preferred
    stock dividends .......................................       7.09%+++    7.19%       7.32%       7.74%       7.80%       7.43%
Preferred stock dividends .................................       1.53%+++    1.03%       1.64%       1.97%       1.55%       1.35%
Net investment income available to
    common shareholders ...................................       5.56%+++    5.56%       5.68%       5.77%       6.25%       6.08%
SUPPLEMENTAL DATA:
Average net assets of common shareholders
    (in thousands) ........................................    $456,427    $444,895    $434,692    $417,017    $400,555    $420,532
Portfolio turnover ........................................           0%         11%          8%         27%         64%         15%
Net assets of common shareholders,
  end of period (in thousands) ............................    $455,954    $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    $206,000
Asset coverage per share of preferred stock,
  end of period# ..........................................    $ 80,334    $ 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.
+++  Annualized.

The information above represents the unaudited operating  performance data for a
share of common stock outstanding,  total investment  return,  ratios to average
net  assets  and  other  supplemental  data  for  the  periods  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 (UNAUDITED)
- --------------------------------------------------------------------------------

NOTE 1. ORGANIZATION & 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 more than 60 days are valued at current
market  quotations.  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, or by amortizing their value on the 61st day prior to maturity, if
their original term to maturity from date of purchase exceeded 60 days.

   SECURITIES  TRANSACTIONS AND INVESTMENT INCOME:  Securities  transactions are
recorded  on the trade  date.  Realized  and  unrealized  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
realized short-term capital gains and other sources, if necessary. Net long-term
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 BlackRock Advisors, Inc., an indirect majority-owned subsidiary of
PNCBank,  N.A., 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 of investment  securities,  other than
short-term  investments  for the six  months  ended  June  30,  1998  aggregated
$810,892. There were no sales, other than short-term investments, during the six
months ended June 30, 1998.

   The federal income tax basis of the Trust's investments at June 30, 1998, was
$595,744,004,  and  accordingly,  gross  and  net  unrealized  appreciation  was
$61,723,792.

                                       12

<PAGE>

NOTE 4. CAPITAL    There are 200 million  shares of $.01 par value common common
stock authorized.  Of the 27,207,093 common shares outstanding at June 30, 1998,
the Adviser owned 7,093 shares.  As of June 30, 1998, 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 2.40% to 4.05% during the
six months ended June 30, 1998.

   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 June 30, 1998,  the Board of Directors of the
Trust  declared a dividend  from  undistributed  earnings of $0.06625 per common
share payable July 31, 1998 to shareholders of record on July 15, 1998.

   For the period  July 1, 1998 to July 31,  1998  dividends  and  distributions
declared  on  preferred  shares  totalled  $569,791  in  aggregate  for the four
outstanding preferred share series.

                                       13

<PAGE>

- --------------------------------------------------------------------------------
                      BLACKROCK FINANCIAL MANAGEMENT, INC.
                           SUMMARY OF CLOSED-END FUNDS
- --------------------------------------------------------------------------------

TAXABLE TRUSTS
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

<S>                                                                         <C>         <C>  
                                                                            STOCK       MATURITY
PERPETUAL TRUSTS                                                            SYMBOL        DATE
                                                                            ------      --------
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.

                                       18

<PAGE>

- --------------------------------------------------------------------------------
                      BLACKROCK FINANCIAL MANAGEMENT, INC.
                                   AN OVERVIEW
- --------------------------------------------------------------------------------

      BlackRock Financial  Management,  Inc.  ("BlackRock") is an SEC-registered
investment  adviser.  BlackRock and its  affiliates  currently  manage over $119
billion  on behalf of  taxable  and  tax-exempt  clients  worldwide.  Strategies
include  fixed  income,  equity and cash and may  incorporate  both domestic and
international securities. BlackRock manages twenty-one closed-end funds that are
traded on either the New York or  American  stock  exchanges,  and a $23 billion
family of open-end equity and bond funds. Current  institutional  clients number
334, domiciled in the United States and overseas.

      BlackRock's  fixed  income  product  was  introduced  in 1988 by a team of
highly seasoned fixed income  professionals.  These  professionals had extensive
experience   creating,   analyzing   and  trading  a  variety  of  fixed  income
instruments,  including the most complex structured securities. In fact, several
individuals  at BlackRock  were  responsible  for  developing  many of the major
innovations  in  the  mortgage-backed   and  asset-backed   securities  markets,
including   the  creation  of  the  first  CMO,  the  floating   rate  CMO,  the
senior/subordinated pass-through and the multi-class asset-backed security.

      BlackRock  is unique  among asset  management  and  advisory  firms in the
emphasis it places on the  development of proprietary  analytical  capabilities.
Over one  quarter  of the  firm's  professionals  is  dedicated  to the  design,
maintenance  and use of these  systems,  which are not  otherwise  available  to
investors. BlackRock's proprietary analytical tools are used for evaluating, and
designing fixed income investment  strategies for client portfolios.  Securities
purchased include mortgages,  corporate bonds,  municipal bonds and a variety of
hedging instruments.

      BlackRock  has  developed  investment  products that respond to investors'
needs and has been  responsible  for several  major  innovations  in  closed-end
funds. In fact,  BlackRock  introduced the first  closed-end  mortgage fund, the
first taxable and tax-exempt  closed-end funds to offer a finite term, the first
closed-end  fund to  achieve a AAA rating by  Standard  & Poor's,  and the first
closed-end  fund to invest  primarily in North American  Government  securities.
Currently,  BlackRock's closed-end funds have dividend reinvestment plans, which
are designed to provide  ongoing  demand for the stock in the secondary  market.
BlackRock  manages a wide range of  investment  vehicles,  each having  specific
investment objectives and policies.

      In view of our continued  desire to provide a high level of service to all
our shareholders, BlackRock maintains a toll-free number for your questions. The
number is (800) 227-7BFM (7236).  We encourage you to call us with any questions
that you may have about your BlackRock  funds and we thank you for the continued
trust that you place in our abilities.

                      IF YOU WOULD LIKE FURTHER INFORMATION
           PLEASE DO NOT HESITATE TO CALL BLACKROCK AT (800) 227-7BFM

<PAGE>


- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                           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 the 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.

      The Annual Meeting of Trust  Shareholders  was held May 6, 1998 to vote on
the following matters:

      (1) To elect two Directors to serve as follows:

          DIRECTOR                                   CLASS    TERM     EXPIRING
          --------                                   -----    ----     --------
          Walter F. Mondale ......................     II    3 years     2001
          Ralph L.Schlosstein ....................     II    3 years     2001
 
          Directors  whose term of office  continues  beyond  this  meeting  are
          Andrew D.Brimmer,  Richard E. Cavanagh,  Kent Dixon, Frank J. Fabozzi,
          Laurence D. Fink, James Grosfeld and James Clayburn La Force, Jr.

      (2) To ratify the selection of Deloitte & Touche LLP as independent public
          accountants of the Trust for the fiscal year ending December 31, 1998.

          Shareholders  elected the two  Directors and ratified the selection of
          Deloitte & Touche LLP. The results of the voting was as follows:

                                        VOTES FOR    VOTES AGAINST   ABSTENTIONS
                                        ---------    -------------   -----------
         Walter F.Mondale ............  20,002,324        0            259,686
         Ralph L.Schlosstein .........  19,819,963        0            442,047
         Ratification of 
            Deloitte & Touche LLP ....  19,910,399     117,807         233,804

                                       14

<PAGE>

- --------------------------------------------------------------------------------
             THE BLACKROCK FLORIDA INSURED MUNICIPAL 2008 TERM TRUST
                               INVESTMENT SUMMARY
- --------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE

The  Trust's  investment  objective  is to provide  current  income  exempt from
federal income tax and Florida  intangible  personal property 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")  is  an  SEC-registered
investment  adviser.  BlackRock and its  affiliates  currently  manage over $118
billion  on behalf of  taxable  and  tax-exempt  clients  worldwide.  Strategies
include  fixed  income,  equity and cash and may  incorporate  both domestic and
international   securities.   Domestic  fixed  income  strategies   utilize  the
government,  mortgage,  corporate and municipal bond sectors.  BlackRock manages
twenty-one  closed-end  funds that are traded on either the New York or American
stock  exchanges,  and a $23 billion  family of open-end  equity and bond funds.
Current  institutional  clients  number 334,  domiciled in the United States and
overseas.

WHAT CAN THE TRUST INVEST IN?

The  Trust  intends  to invest  at least  80% of its  total  assets  in  Florida
municipal  obligations  insured  as to  the  timely  payment  of  principal  and
interest.  The  Trust  may  invest  up to 20%  in  uninsured  Florida  municipal
obligations  which are rated Aaa by Moody's or AAA by S&P, or are  determined by
the 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 Florida municipal
obligations  and  retaining a small  amount of income each year.

In addition to seeking the return of the  initial  offering  price,  the Adviser
also seeks to provide  current income exempt from federal income tax and Florida
intangible  personal 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.
Since shorter-term  securities typically yield less than longer-term securities,
this strategy  will likely result in a decline in the Trust's  income over time.
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 high interest rate volatility, force a choice between current income and
risking the return of the initial  offering  price, it is likely that 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 Trust 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.

                                       15

<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  CONSIDERATIONS.  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:  BRF) 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 to do so to only a
limited extent. Investing 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.

                                       16

<PAGE>

- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 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 on
                       Saturday  and THE  NEW  YORK  TIMES  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.

PRE-REFUNDED 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.

                                       17

<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 Adminstrators, L.P.
P.O. Box 9095
Princeton, NJ 08543-9095
(800) 543-6217
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

                      The accompanying financial statements
                   as of June 30, 1998, were not audited and,
                 accordingly, no opinion is expressed on them.

                   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.
- --------------------
SEMI-ANNUAL REPORT
JUNE 30, 1998

[GRAPHIC OMITTED]



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