KEYSTONE WORLD BOND FUND
N-30D, 1996-06-17
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[front cover]

                                    KEYSTONE

                  [photo of spyglass with world map behind it]

                                     WORLD
                                   BOND FUND

                                [Keystone logo]

                               SEMIANNUAL REPORT
                                 APRIL 30, 1996

<PAGE>

PAGE 1 
- --------------------------------- 
Keystone World Bond Fund 
Seeks current income from debt securities in the U.S. and abroad 

Dear Shareholder: 

We are writing to report to you on activities of Keystone World Bond Fund for 
the six-month period which ended April 30, 1996. 

Performance 

For the periods which ended April 30, 1996, your Fund produced the following 
total returns. 

  Class A shares returned 5.16% for the six-month period and 14.04% for the 
twelve-month period. 

  Class B shares returned 4.66% for the six-month period and 12.91% for the 
twelve-month period. 

  Class C shares returned 4.67% for the six-month period and 12.96% for the 
twelve-month period. 

  This highly satisfactory performance reflects your Fund's careful asset 
allocation during the period. The Salomon World Government Bond Index 
returned -0.13% and 2.97% respectively for the six- and twelve-month periods. 
The Lehman Aggregate Bond Index returned 0.52% for six-month period and 8.63% 
for twelve-month period. 

Market Environment 

Bond markets worldwide responded favorably to lower rates during the period. 
In Europe, favorable conditions continued throughout the six-month period, 
helped by low inflation in Germany, Spain, Denmark and France. The U.S. 
market performed well from November through February, but experienced some 
volatility in March when it appeared that the economy was growing faster than 
many economists had expected, and long-term interest rates rose. The emerging 
markets rebounded in November and December, then rose higher in January and 
February, due to an influx of new money from institutional investors after 
the first of the year. A stronger U.S. dollar helped the markets of 
Australia, New Zealand and Canada. 

Greater emphasis on Europe 

We increased the Fund's exposure to European bonds during the period to take 
advantage of low inflation and low economic growth. While interest rates had 
stopped declining in the U.S., they were still trending lower in Europe 
throughout the period. European securities accounted for 36% of your Fund's 
holdings on April 30, 1996, up from 27% on October 31, 1995. We positioned 
our U.S. holdings more defensively toward the end of the period by selling 
holdings we believed were most susceptible to higher interest rates. 

Looking Ahead 

We believe the U.S. market may remain somewhat volatile in the short term but 
that rates may trend lower before they head upward again. We believe 
conditions in Europe will continue to remain attractive, and expect rates to 
continue their downward trend. We think credit quality should begin to 
improve in Latin America, providing a more solid foundation for the gains we 
have already seen in the markets. The stronger dollar should also help limit 
currency volatility. We believe investment returns on world bonds will come 
primarily from income rather than capital appreciation. 

                                                      (continued on next page) 

<PAGE>
 
PAGE 2 
- --------------------------------- 
Keystone World Bond Fund 

  We appreciate your continued support of Keystone funds. If you have any 
questions or comments, please feel free to write to us. 

Sincerely, 

/s/Albert H.Elfner, III                     /s/ George S. Bissell

Albert H. Elfner, III                       George S. Bissell 
Chairman and President                      Chairman of the Board 
Keystone Investments, Inc.                  Keystone Funds 

June 1996 

[Dalbar logo]  Dalbar Key Honors 
               Honoring Commitment to Excellence 
               Keystone was recently recognized by Dalbar, an independent 
               mutual fund rating organization, for demonstrating a 
               commitment to serving the needs of customers. The award is 
               intended to distinguish companies who are committed to 
               investors and have a proven ability to provide good service. 

[start screen box] 

[receiver graphic] 

Keystone Introduces Investment Insight Line for Shareholders 

Now you can keep up-to-date on your fund's current strategy and outlook by 
calling Keystone Investment Insight Line. You can hear Keystone portfolio 
managers discuss their latest strategies. You can also listen to Keystone's 
overall market outlook from James McCall, Chief Investment Officer. The 
service is available 24 hours a day, seven days a week and updated at least 
monthly. 

Keystone Investment Insight Line                1-800-346-3858, Press 2 

[telephone graphic] 

[end screen box] 

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PAGE 3 
- --------------------------------- 

                              A Discussion With 
                              Your Fund Manager 

Gilman C. Gunn is portfolio manager of your Fund and leads Keystone's 
international investment team. An investment professional with 23 years of 
experience, Mr. Gunn has spent more than ten years in investment management 
positions in London, Kuwait and Thailand. 

Keystone's international team is comprised of several investment 
professionals who have expertise on the economic, political and business 
environments in specific areas. Mr. Gunn is supported by Richard Wisentaner, 
international fixed-income analyst. 

Q  How would you characterize the world bond market over the past six months? 

A  The bond world markets generally rose at the start of the period, taking 
their lead from falling rates in the U.S. The European market remained 
positive throughout the period, due to low inflation and improving economic 
fundamentals in many European countries. Unexpectedly high U.S. employment 
numbers released in early March sparked inflation fears, and lowered bond 
prices in the U.S. and emerging markets. Even so, emerging markets gained 
ground during the six-month period. In Canada, defeat of the Quebec 
referendum had a positive effect, removing the risk premium from Canadian 
bonds. 

Q  How did the Fund perform? 

A  Your Fund benefitted from the generally favorable environment for world 
bonds during the period. Extensive exposure to European bonds helped 
compensate for declines in the U.S. market during March and April. The 
investment grade bonds in the portfolio (bonds rated in the top four rating 
categories) provided a reliable income base. Canadian, Danish and Swedish 
government bonds were among the largest investment grade holdings. In keeping 
with your Fund's high income strategy, about 34% of assets were invested in 
higher-yielding, dollar-denominated Latin American bonds. These holdings 
appreciated in value as economic conditions in many Latin American countries 
improved. Real yields (measured after inflation) on Australian securities 
were attractive. Your Fund's dollar-block holdings benefitted from a stronger 
U.S. dollar during the period. 

Q   How were the Fund's assets diversified? 

A  To reduce overall investment risk, we diversify Fund investments among 
dollar-block, European and emerging markets. Dollar-block markets are 
generally linked to the U.S. dollar, such as Canada, Australia and New 
Zealand. European bond markets are primarily influenced by German bond market 
activity. Latin America represents the emerging markets exposure. 

  During the period we added to holdings in Europe, especially in Italy, and 
reduced holdings in the U.S. As of April 30, 1996, 26.8% of the Fund's assets 
were invested in the dollar-block markets, with the largest holding in 
Canadian government bonds. European holdings accounted for 32% of net assets 
and dollar-denominated Latin American bonds totaled 34%. 

Q   How did the improved strength of the U.S. dollar affect the Fund? 

A  It helped the value of your Fund's dollar-denominated and hedged 
securities. As of April 30, 1996, 51% of Fund holdings were invested in or 
hedged into U.S. dollars. The Fund usually has a high dollar-weighting. We 
hold cash in dollars, we invest 

[start screen box] 

Fund Profile 

Objective: Seeks current income from debt securities in the U.S. and abroad. 

Commencement of investment operations: January 9, 1987 

Average quality: A 

Average maturity: 6 years 

Net assets: $14.5 million 

[end screen box] 

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PAGE 4 
- --------------------------------- 

Geographic Diversification 
as of April 30, 1996 

- -------------------- 
Americas         49% 
- -------------------- 
Europe           36% 
- -------------------- 
Pacific          14% 
- -------------------- 
Other(1)          1% 
- -------------------- 

in countries with currencies linked to the U.S. dollar, such as Canada, and 
we hedge some non-dollar-denominated securities into U.S. dollars. 

Q  What is your outlook? 

A  We believe the prospects for non-U.S. bonds are good. We think the 
recovery in Latin American dollar-denominated bonds will continue, drawing 
greater support from improved economic fundamentals in those countries. We 
believe more traditional U.S. high yield investors will be attracted to Latin 
American dollar bonds because of the historically narrow yield spreads on 
U.S. high yield instruments. In Europe, we expect to see rates fall even 
lower and expect inflation to remain low as well. 

                                  [diamond] 

                      This column is intended to answer 
                          questions about your Fund. 
       If you have a question you would like answered, please write to: 
                  Keystone Investment Distributors Company, 
                 Attn: Shareholder Communications, 22nd Floor 
            200 Berkeley Street, Boston, Massachusetts 02116-5034. 

- ------------- 
(1)Includes other assets and liabilities and short-term obligations. 

<PAGE>
 
PAGE 5 
- --------------------------------- 

                           Your Fund's Performance 

[typeset representation of mountain chart]

Growth of an investment in
Keystone World Bond Fund Class A

In Thousands

        Initial Investment      Reinvested Distributions
1/87         9458                         9458
             9619                         9777
4/88        10177                        11215
             9315                        10845
4/90         8782                        10850
             9344                        12625
4/92         9629                        13928
             8744                        15509
4/94         8506                        16076
             7667                        15674
4/96         8144                        17875

A $10,000 investment in Keystone World Bond Fund Class A made on January 9, 1987
with all distributions reinvested was worth $17,875 on April 30, 1996. Past
performance is no guarantee of future results.

Six-Month Performance                           as of April 30, 1996 

- -------------------------------------------------------------------- 
                              Class A       Class B       Class C 
Total returns*                  5.16%         4.66%          4.67% 
Net asset value  10/31/95      $8.42         $8.45          $8.42 
                  4/30/96      $8.55         $8.57          $8.54 
Dividends                      $0.30         $0.27          $0.27 
Capital gains                   None          None           None 

* Before deduction of front-end or contingent deferred sales charge (CDSC). 

Historical Record                                as of April 30, 1996 

- ---------------------------------------------------------------------- 
Cumulative total returns        Class A       Class B       Class C 
1-year w/o sales charge          14.04%        12.91%         12.96% 
1-year                            8.62%         8.91%         12.96% 
5-year                           34.85%          --             -- 
Life of class                    78.75%         4.99%          7.38% 
Average Annual Returns 
1-year w/o sales charge          14.04%        12.91%         12.96% 
1-year                            8.62%         8.91%         12.96% 
5-year                            6.16%          --             -- 
Life of class                     6.44%         1.79%          2.63% 

Class A shares were introduced on January 9, 1987. Performance is reported at 
the current maximum front-end sales charge of 4.75%. 

  Class B shares were introduced on August 2, 1993. Shares purchased after 
June 1, 1995 are subject to a contingent deferred sales charge (CDSC) that 
declines from 5% to 1% over six years from the month purchased. Performance 
assumes that shares were redeemed after the end of a one-year holding period 
and reflects the deduction of a 4% CDSC. 

  Class C shares were introduced on August 2, 1993. Performance reflects the 
return you would have received on shares held for at least one year and 
redeeming after the end of the period. 

  The investment return and principal value will fluctuate so that your 
shares, when redeemed, may be worth more or less than the original cost. 
Performance for each class will differ. 

  You may exchange your shares for another Keystone fund by phone or in 
writing for a $10 fee. The exchange fee is waived for individual investors 
who make an exchange using Keystone's Automated Response Line (KARL). The 
Fund reserves the right to change or terminate the exchange offer. 

<PAGE>
 
PAGE 6 
- --------------------------------- 
Keystone World Bond Fund 

SCHEDULE OF INVESTMENTS--April 30, 1996 
(Unaudited) 

<TABLE>
<CAPTION>
                                                            Coupon     Maturity      Principal       Market 
                                                             Rate        Date         Amount          Value 
- --------------------------------------------------------     ------    ---------    ------------   ----------- 
<S>                                                         <C>      <C>          <C>              <C>
FOREIGN GOVERNMENT AGENCIES AND ISSUES (93.2%) 
AUSTRALIAN DOLLAR (3.3%) 
New South Wales Treasury                                    12.600%   5/01/2006         500,000    $  483,720 
- --------------------------------------------------------      ----      -------      ----------      --------- 
CANADIAN DOLLAR (13.0%) 
Government of Canada                                         8.750   12/01/2005       1,500,000     1,171,686 
Government of Canada                                         7.500    9/01/2000         950,000       710,668 
- --------------------------------------------------------      ----      -------      ----------      --------- 
                                                                                                    1,882,354 
- --------------------------------------------------------      ----      -------      ----------      --------- 
DANISH KRONE (9.5%) 
Kingdom of Denmark                                           7.000   12/15/2004       3,750,000       636,966 
Kingdom of Denmark                                           9.000   11/15/1998       4,000,000       742,935 
- --------------------------------------------------------      ----      -------      ----------      --------- 
                                                                                                    1,379,901 
- --------------------------------------------------------      ----      -------      ----------      --------- 
GERMAN DEUTCHE MARK (4.5%) 
Federal Republic of Germany                                  6.875    5/12/2005         950,000       645,124 
- --------------------------------------------------------      ----      -------      ----------      --------- 
ITALIAN LIRA (4.9%) 
Republic of Italy                                            9.500    2/01/2006   1,105,000,000       701,908 
- --------------------------------------------------------      ----      -------      ----------      --------- 
NETHERLANDS GUILDER (3.9%) 
Netherlands Government                                       7.750    3/01/2005         875,000       564,524 
- --------------------------------------------------------      ----      -------      ----------      --------- 
NEW ZEALAND DOLLAR (10.5%) 
New Zealand Government                                       9.000   11/15/1996         850,000       582,452 
New Zealand Government                                       8.000    4/15/2004         750,000       495,380 
New Zealand Government                                       6.500    2/15/2000         700,000       443,841 
- --------------------------------------------------------      ----      -------      ----------      --------- 
                                                                                                    1,521,673 
- --------------------------------------------------------      ----      -------      ----------      --------- 
SPANISH PESETA (4.6%) 
Kingdom of Spain                                            11.450    8/30/1998      32,000,000       269,812 
Kingdom of Spain                                            11.850    8/30/1996      24,000,000       189,847 
Kingdom of Spain                                            12.250    3/25/2000      23,000,000       203,546 
- --------------------------------------------------------      ----      -------      ----------      --------- 
                                                                                                      663,205 
- --------------------------------------------------------      ----      -------      ----------      --------- 
SWEDISH KRONA (4.8%) 
Kingdom of Sweden                                           10.250    5/05/2003       6,000,000       695,766 
- --------------------------------------------------------      ----      -------      ----------      --------- 
UNITED STATES DOLLAR (34.2%) 
Cellulose Nipo--Brasileira                                   9.375   12/21/2003         830,000       813,400 
Companhia Brasilieras de Petroleo Ipiranga                   8.625    2/25/2002         550,000       547,938 
Ispat Mexicana S.A.                                         10.375    3/15/2001       1,025,000       968,625 
Klabin Fabricadora Papel                                    12.125   12/28/2002         250,000       257,500 
Telecom Argentina Stet France                                8.375   10/18/2000         500,000       483,125 

<PAGE>

PAGE 7
- ------------------------------------

SCHEDULE OF INVESTMENTS--April 30, 1996
(Unaudited)

 
                                                            Coupon     Maturity      Principal       Market 
                                                             Rate        Date         Amount          Value 
- --------------------------------------------------------     ------    ---------    ------------   ----------- 
UNITED STATES DOLLAR -- CONTINUED 
Telecom Argentina Stet France                               12.000%  11/15/2002       190,000      $   204,250 
Telecommunicacaos Brasileiras S.A. (a)                      10.000   10/22/1997       200,000          204,750 
Telecommunicacaos Brasileiras S.A.                          10.000   10/22/1997       100,000          102,375 
Telefonica de Argentina                                     11.875   11/01/2004       760,000          809,400 
Yacimientos Petroliferos Fiscales S.A. (YPF)                 8.000    2/15/2004       600,000          568,500 
- --------------------------------------------------------      ----      -------      ----------      --------- 
                                                                                                     4,959,863 
- --------------------------------------------------------      ----      -------      ----------      --------- 
TOTAL FOREIGN & U.S. GOV'TS AGENCIES & ISSUES (Cost--$12,987,796)                                   13,498,038 
- -------------------------------------------------------------------------------      ----------      --------- 
REPURCHASE AGREEMENT (1.7%) 
Keystone Joint Repurchase Agreement                                                  Maturity 
  (Investments in repurchase agreements, in a joint                                    Value 
  trading account, purchased 4/29/96)(Cost $251,000) (b)     5.340    5/01/1996      $251,074          251,000 
- --------------------------------------------------------      ----      -------      ----------      --------- 
TOTAL INVESTMENTS (COST $13,238,796)                                                                13,749,038 
- --------------------------------------------------------      ----      -------      ----------      --------- 
OTHER ASSETS AND LIABILITIES--NET (5.1%)                                                               738,834 
- --------------------------------------------------------      ----      -------      ----------      --------- 
NET ASSETS (100.0%)                                                                                $14,487,872 
- --------------------------------------------------------      ----      -------      ----------      --------- 
</TABLE>

NOTES TO SCHEDULE OF INVESTMENTS: 

(a) Securities that may be resold to "qualified institutional buyers" under 
    Rule 144A of the Federal Securities Act of 1933. These securities have 
    been determined to be liquid under guidelines established by the Board of 
    Trustees. 

(b) The repurchase agreements are fully collateralized by U.S. Government 
    and/or agency obligations based on market prices at April 30, 1996. 

See Notes to Financial Statements. 

<PAGE>
 
PAGE 8 
- --------------------------------- 
Keystone World Bond Fund 

SCHEDULE OF FORWARD FOREIGN CURRENCY CONTRACTS 

<TABLE>
<CAPTION>
                                                                                           Net Unrealized 
 Exchange                                            U.S. $ Value at     In Exchange        Appreciation/ 
   Date                                              April 30, 1996       for U.S. $       (Depreciation) 
- ---------     ----------    ----------------------   ---------------   ---------------     ---------------- 
<S>         <C>             <C>                      <C>               <C>                 <C>
Forward Foreign Currency Exchange Contracts to Sell: 
- ---------------------------------------------------------------------------------------------------------- 
05/03/96    846,367,188     Italian Lira                $541,848           $541,155            ($   693) 
05/13/96        323,590     Australian Dollar            253,996            244,000             (9,996) 
05/13/96     21,052,080     Spanish Peseta               165,363            168,000              2,637 
05/20/96        355,000     Danish Krone                 341,671            355,000             13,329 
05/20/96         78,306     Pound Sterling               177,835            120,000              2,165 
05/20/96        484,818     Netherlands Guilde           283,365            296,000             12,635 
05/31/96        740,966     Deutsche Mark                484,856            512,000             27,144 
07/05/96      1,160,454     Swedish Krona                170,814            173,500              2,687 
                                                                                           --------------- 
                                                                                                49,908 
                                                                                           --------------- 

Forward Foreign Currency Exchange Contracts to Receive: 
- ---------------------------------------------------------------------------------------------------------- 
05/03/96    333,489,421     Italian Lira                $213,502           $213,229            $   273 
05/20/96         78,306     Pound Sterling               117,835            118,207               (372) 
                                                                                           --------------- 
                                                                                                   (99) 
                                                                                           --------------- 
Net Unrealized Appreciation/Depreciation on Forward Foreign Currency Exchange Contracts        $49,809 
                                                                                           =============== 
</TABLE>

See Notes to Financial Statements. 

<PAGE>
 
PAGE 9 
- --------------------------------- 

FINANCIAL HIGHLIGHTS--CLASS A SHARES 
(For a share outstanding throughout each period) 

<TABLE>
<CAPTION>
                                              Six Months                                 Period from 
                                                Ended             Year Ended         January 1, 1994 to 
                                            April 30, 1996     October 31, 1995       October 31, 1994 
 =======================================   ===============     ==================    ==================== 
                                             (Unaudited) 
<S>                                             <C>                 <C>                    <C>
Net asset value beginning of period              $8.42               $8.42                  $9.56 
 ---------------------------------------      -------------     -----------------      ------------------ 
Income from investment operations 
Net investment income                             0.30                0.61                   0.32 
Net realized and unrealized gain (loss) 
  on investment and foreign currency 
  related transactions                            0.13               (0.01)                 (0.96) 
 ---------------------------------------      -------------     -----------------      ------------------ 
Total from investment operations                  0.43                0.60                  (0.64) 
 ---------------------------------------      -------------     -----------------      ------------------ 
Less distributions from: 
Net investment income                            (0.30)              (0.54)                     0 
In excess of net investment income (c)               0                   0                      0 
Tax basis return of capital                          0               (0.06)                 (0.50) 
Net realized gains on investments and 
  foreign currency related transactions              0                   0                      0 
 ---------------------------------------      -------------     -----------------      ------------------ 
Total distributions                              (0.30)              (0.60)                 (0.50) 
 ---------------------------------------      -------------     -----------------      ------------------ 
Net asset value end of period                    $8.55               $8.42                  $8.42 
 =======================================      =============     =================      ================== 
Total return (d)                                  5.16%               7.62%                 (6.72%) 
Ratios/supplemental data 
Ratios to average net assets: 
 Total expenses (a),(e)                           2.21%(b)            2.46%                  2.20%(b) 
 Net investment income                            7.06%(b)            7.21%                  4.66%(b) 
Portfolio turnover rate                             28%                108%                   100% 
 ---------------------------------------      -------------     -----------------      ------------------ 
Net assets end of period (thousands)            $8,971              $9,956                 $6,047 
 =======================================      =============     =================      ================== 
</TABLE>

<TABLE>
<CAPTION>
                                                             Year Ended December 31, 
                                               1993           1992           1991            1990 
 =======================================    ===========    ===========    ===========   ============= 

<S>                                           <C>            <C>            <C>             <C>
Net asset value beginning of period            $8.69         $10.77           $9.82           $9.76 
 ---------------------------------------      ---------      ---------      ---------      ----------- 
Income from investment operations 
Net investment income                           0.44           0.64            0.66            0.63 
Net realized and unrealized gain (loss) 
  on investment and foreign currency 
  related transactions                          1.03          (0.79)           0.99            0.31 
 ---------------------------------------      ---------      ---------      ---------      ----------- 
Total from investment operations                1.47          (0.15)           1.65            0.94 
 ---------------------------------------      ---------      ---------      ---------      ----------- 
Less distributions from: 
Net investment income                          (0.43)         (0.96)          (0.45)          (0.52) 
In excess of net investment income (c)         (0.17)         (0.28)              0           (0.04) 
Tax basis return of capital                        0              0               0               0 
Net realized gains on investments and 
  foreign currency related transactions            0          (0.69)          (0.25)          (0.32) 
 ---------------------------------------      ---------      ---------      ---------      ----------- 
Total distributions                            (0.60)         (1.93)          (0.70)          (0.88) 
 ---------------------------------------      ---------      ---------      ---------      ----------- 
Net asset value end of period                  $9.56          $8.69          $10.77           $9.82 
 =======================================      =========      =========      =========      =========== 
Total return (d)                               17.26%         (1.24%)         17.48%          10.11% 
Ratios/supplemental data 
Ratios to average net assets: 
 Total expenses (a),(e)                         2.20%          2.20%           2.00%           2.00% 
 Net investment income                          4.62%          5.44%           6.43%           6.48% 
Portfolio turnover rate                          107%           185%            204%            154% 
 ---------------------------------------      ---------      ---------      ---------      ----------- 
Net assets end of period (thousands)          $8,403         $7,121         $11,843         $13,833 
 =======================================      =========      =========      =========      =========== 
</TABLE>

(a) Figures are net of expense reimbursement by Keystone in connection with 
    voluntary expense limitations. Before the expense reimbursement, the 
    "Ratio of total expenses to average net assets" would have been 2.25%, 
    3.12%, 2.50%, 2.15% and 2.47% for the period from January 1, 1994 to 
    October 31, 1994 and the years ended December 31, 1993, 1992, 1991 and 
    1990, respectively. 

(b) Annualized. 

(c) Effective January 1, 1993, the Fund adopted Statement of Position 93-2: 
    "Determination, Disclosure, and Financial Statement Presentation of 
    Income, Capital Gain and Return of Capital Distributions by Investment 
    Companies". As a result, distribution amounts exceeding book basis net 
    investment income (or tax basis net income on a temporary basis) are 
    presented as "Distributions in excess of net investment income". 
    Similarly, capital gain distributions in excess of book basis capital 
    gains (or tax basis capital gains on a temporary basis) are presented as 
    "Distributions in excess of capital gains". For the fiscal years ended 
    December 31, 1992 and 1990, distributions in excess of book basis net 
    investment income were charged to paid-in capital. 

(d) Excluding applicable sales charges. 

(e) The expense ratio includes indirectly paid expenses for the period ended 
    April 30, 1996 and the year ended October 31, 1995. Excluding indirectly 
    paid expenses, the expense ratios would have been 2.19% and 2.44% for the 
    respective periods. 

See Notes to Financial Statements. 

<PAGE>
 
PAGE 10 
- --------------------------------- 
Keystone World Bond Fund 

FINANCIAL HIGHLIGHTS--CLASS B SHARES 
(For a share outstanding throughout each period) 

<TABLE>
<CAPTION>
                                                                                             August 2, 1993 
                                     Six Months                           Period from       (Date of Initial 
                                       Ended           Year Ended      January 1, 1994 to  Public Offering) to 
                                   April 30, 1996   October 31, 1995    October 31, 1994    December 31, 1993 
 ===============================  ================   ================  ==================   =================== 
                                    (Unaudited) 

<S>                                    <C>               <C>                 <C>                 <C>
Net asset value beginning of 
  period                                $8.45             $8.46               $9.58               $9.47 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Income from investment 
  operations 
Net investment income                    0.26              0.52                0.31                0.16 
Net realized and unrealized 
  gain (loss) on investment and 
  foreign currency related 
  transactions                           0.13              0.01               (0.99)               0.21 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Total from investment 
  operations                             0.39              0.53               (0.68)               0.37 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Less distributions from: 
Net investment income                   (0.27)            (0.48)                  0               (0.11) 
In excess of net investment 
  income (c)                                0                 0                   0               (0.15) 
Tax basis return of capital                 0             (0.06)              (0.44)                  0 
Net realized gains on 
  investments and foreign 
  currency related transactions             0                 0                   0                   0 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Total distributions                     (0.27)            (0.54)              (0.44)              (0.26) 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Net asset value end of period           $8.57             $8.45               $8.46               $9.58 
 ===============================   ===============   ===============    =================    ================= 
Total return (d)                         4.66%             6.68%              (7.18%)              3.93% 
Ratios/supplemental data 
Ratios to average net assets: 
 Total expenses (a),(e)                  2.96%(b)          3.21%               2.95%(b)            2.95%(b) 
 Net investment income                   6.25%(b)          6.43%               4.05%(b)            3.79%(b) 
Portfolio turnover rate                    28%              108%                100%                107% 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Net assets end of period 
  (thousands)                          $4,405            $3,680              $3,429              $2,544 
 ===============================   ===============   ===============    =================    ================= 
</TABLE>

(a) Figures are net of expense reimbursement by Keystone in connection with 
    voluntary expense limitations. Before the expense reimbursement, the 
    "Ratio of total expenses to average net assets" would have been 3.03% and 
    3.47% for the period from January 1, 1994 to October 31, 1994 and for the 
    period from August 2, 1993 (Date of Initial Public Offering) to December 
    31, 1993, respectively. 

(b) Annualized. 

(c) Effective January 1, 1993, the Fund adopted Statement of Position 93-2: 
    "Determination, Disclosure, and Financial Statement Presentation of 
    Income, Capital Gain and Return of Capital Distributions by Investment 
    Companies". As a result, distribution amounts exceeding book basis net 
    investment income (or tax basis net income on a temporary basis) are 
    presented as "Distributions in excess of net investment income". 
    Similarly, capital gain distributions in excess of book basis capital 
    gains (or tax basis capital gains on a temporary basis) are presented as 
    "Distributions in excess of capital gains". 

(d) Excluding applicable sales charges. 

(e) The expense ratio includes indirectly paid expenses for the period ended 
    April 30, 1996 and the year ended October 31, 1995. Excluding indirectly 
    paid expenses, the expense ratios would have been 2.94% and 3.19% for the 
    respective periods. 

See Notes to Financial Statements. 

<PAGE>
 
PAGE 11 
- --------------------------------- 

FINANCIAL HIGHLIGHTS--CLASS C SHARES 
(For a share outstanding throughout each period) 

<TABLE>
<CAPTION>
                                                                                             August 2, 1993 
                                     Six Months                           Period from       (Date of Initial 
                                       Ended           Year Ended      January 1, 1994 to  Public Offering) to 
                                   April 30, 1996   October 31, 1995    October 31, 1994    December 31, 1993 
 ===============================  ================   ================  ==================   =================== 
                                    (Unaudited) 

<S>                                    <C>               <C>                 <C>                 <C>
Net asset value beginning of 
  period                                $8.42             $8.42               $9.58               $9.47 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Income from investment 
  operations 
Net investment income                    0.27              0.56                0.30                0.18 
Net realized and unrealized 
  gain (loss) on investment 
  and foreign currency related 
  transactions                           0.12             (0.02)              (1.02)               0.19 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Total from investment 
  operations                                0              0.54               (0.72)               0.37 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Less distributions from: 
Net investment income                   (0.27)            (0.48)                  0               (0.12) 
In excess of net investment 
  income (c)                                0                 0                   0               (0.14) 
Tax basis return of capital                 0             (0.06)              (0.44)                  0 
Net realized gains on 
  investments and foreign 
  currency related transactions             0                 0                   0                   0 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Total distributions                        (0)            (0.54)              (0.44)              (0.26) 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Net asset value end of period           $8.54             $8.42               $8.42               $9.58 
 ===============================   ===============   ===============    =================    ================= 
Total return (d)                         4.67%             6.83%              (7.61%)              3.93% 
Ratios/supplemental data 
Ratios to average net assets: 
 Total expenses (a),(e)                  2.96%(b)          3.21%               2.95%(b)            2.95%(b) 
 Net investment income                   6.23%(b)          6.43%               3.94%(b)            3.79%(b) 
Portfolio turnover rate                    28%              108%                100%                107% 
 -------------------------------   ---------------   ---------------    -----------------    ----------------- 
Net assets, end of period 
  (thousands)                          $1,111            $1,183              $1,591              $1,878 
 ===============================   ===============   ===============    =================    ================= 
</TABLE>

(a) Figures are net of expense reimbursement by Keystone in connection with 
    voluntary expense limitations. Before the expense reimbursement, the 
    "Ratio of operating and management expenses to average net assets" would 
    have been 3.03% and 3.40% for the period from January 1, 1994 to October 
    31, 1994 and for the period from August 2, 1993 (Date of Initial Public 
    Offering) to December 31, 1993, respectively. 

(b) Annualized. 

(c) Effective January 1, 1993, the Fund adopted Statement of Position 93-2: 
    "Determination, Disclosure, and Financial Statement Presentation of 
    Income, Capital Gain and Return of Capital Distributions by Investment 
    Companies". As a result, distribution amounts exceeding book basis net 
    investment income (or tax basis net income on a temporary basis) are 
    presented as "Distributions in excess of net investment income". 
    Similarly, capital gain distributions in excess of book basis capital 
    gains (or tax basis capital gains on a temporary basis) are presented as 
    "Distributions in excess of capital gains". 

(d) Excluding applicable sales charges. 

(e) The expense ratio includes indirectly paid expenses for the period ended 
    April 30, 1996 and the year ended October 31, 1995. Excluding indirectly 
    paid expenses, the expense ratios would have been 2.94% and 3.19% for the 
    respective periods. 

See Notes to Financial Statements. 

<PAGE>
 
PAGE 12 
- --------------------------------- 
Keystone World Bond Fund 

STATEMENT OF ASSETS AND LIABILITIES-- 
April 30, 1996 (Unaudited) 

====================================================    ============ 
Assets: 
  Investments at market value (identified cost-- 
   $13,238,796) (Note 1)                                $13,749,038 
  Cash                                                           32 
  Receivable for: 
   Investments sold                                         541,848 
   Unrealized appreciation on open currency 
    contracts (Notes 1 & 6)                                  60,870 
   Interest                                                 433,952 
   Fund shares sold                                             168 
   Foreign taxes reclaimed                                    9,130 
  Prepaid expenses                                            8,132 
- ----------------------------------------------------    ------------ 
     Total assets                                        14,803,170 
- ----------------------------------------------------    ------------ 
Liabilities: 
  Payable for: 
   Investments purchased                                    213,502 
   Unrealized depreciation on open currency 
    contracts (Notes 1 & 6)                                  11,061 
   Fund shares redeemed                                      16,731 
   Income distribution                                       24,795 
   Foreign taxes withheld                                     3,948 
  Other accrued expenses                                     45,261 
- ----------------------------------------------------    ------------ 
     Total liabilities                                      315,298 
- ----------------------------------------------------    ------------ 
Net assets                                              $14,487,872 
====================================================    ============ 
Net assets represented by: (Note 1) 
  Paid-in capital                                       $15,049,145 
  Accumulated distributions in excess of net 
   investment income                                        (26,993) 
  Accumulated net realized loss on investment and 
   foreign currency related transactions                 (1,092,780) 
  Net unrealized appreciation (depreciation) on: 
   Investments, foreign currency related 
   transactions  and other assets and liabilities           508,691 
   Open currency contracts                                   49,809 
- ----------------------------------------------------    ------------ 
     Total net assets                                   $14,487,872 
====================================================    ============ 
Net Asset Value: (Note 1) 
  Class A Shares 
   Net assets of $8,971,450 / 1,049,905 shares 
    outstanding                                               $8.55 
   Offering price per share ($8.55 / 0.9525) (based 
    on a sales charge of 4.75% of the offering 
    price)                                                    $8.98 
  Class B Shares 
   Net assets of $4,405,119 / 513,948 shares 
    outstanding                                               $8.57 
  Class C Shares 
   Net assets of $1,111,303 / 130,165 shares 
    outstanding                                               $8.54 
- -----------------------------------------------------   ------------ 


STATEMENT OF OPERATIONS-- 
Six Months Ended April 30, 1996 (Unaudited) 

=========================================     =======   ========= 
Investment income: (Note 1) 
  Interest (net of foreign withholding 
   taxes of $1,559)                                     $687,255 
Expenses: (Notes 2 and 4) 
  Management fee                            $ 47,904 
  Transfer agent fees                         30,160 
  Accounting, auditing and legal fees         23,391 
  Custodian fees                              16,921 
  Printing expenses                           13,377 
  Distribution Plan expenses                  38,281 
  Registration fees                           12,925 
  Miscellaneous                                1,372 
- -----------------------------------------     -------   --------- 
    Total expenses                           184,331 
  Less: Expenses paid indirectly (Note 4)       (916) 
- -----------------------------------------     -------   --------- 
    Net expenses                                         183,415 
  Net investment income                                  503,840 
- -----------------------------------------     -------   --------- 
Net realized and unrealized gain (loss) 
 on investments and foreign currency 
 related transactions: (Notes 1 and 3) 
    Net realized gain on investments and 
     foreign currency related 
      transactions                                       186,842 
- -----------------------------------------     -------   --------- 
    Net change in unrealized appreciation 
     (depreciation) on investments and 
     other assets and liabilities            (60,541) 
    Net change in unrealized appreciation 
     (depreciation) on open currency 
     contracts                                91,290 
- -----------------------------------------     -------   --------- 
    Net change in unrealized appreciation 
     (depreciation)                                       30,749 
- -----------------------------------------     -------   --------- 
    Net gain on investments and foreign 
     currency related transactions                       217,591 
- -----------------------------------------     -------   --------- 
    Net increase in net assets resulting 
     from operations                                    $721,431 
=========================================     =======   ========= 

See Notes to Financial Statements. 

<PAGE>
 
PAGE 13 
- --------------------------------- 

STATEMENTS OF CHANGES IN NET ASSETS 

<TABLE>
<CAPTION>
                                                                          Six Months 
                                                                            Ended            Year Ended 
                                                                        April 30, 1996    October 31, 1995 
 ===================================================================   ===============    ================ 
                                                                         (Unaudited) 
<S>                                                                      <C>                <C>
Operations: 
Net investment income                                                    $   503,840        $ 1,011,006 
Net realized gain (loss) on investments and foreign currency 
  related transactions                                                       186,842           (583,415) 
Net change in unrealized appreciation (depreciation)                          30,749            685,420 
 -------------------------------------------------------------------      -------------    --------------- 
  Net increase in net assets resulting from operations                       721,431          1,113,011 
 -------------------------------------------------------------------      -------------    --------------- 
Distributions to shareholders from: (Note 1) 
Net investment income: 
 Class A Shares                                                             (333,167)          (653,425) 
 Class B Shares                                                             (134,960)          (187,676) 
 Class C Shares                                                              (38,495)           (82,887) 
Tax basis return of capital: 
 Class A Shares                                                                    0            (65,389) 
 Class B Shares                                                                    0            (24,167) 
 Class C Shares                                                                    0             (7,767) 
  Total distributions to shareholders                                       (506,622)        (1,021,311) 
 -------------------------------------------------------------------      -------------    --------------- 
Capital share transactions: (Note 2) 
Shares issued in acquisition of Keystone Australia Income Fund: 
  (Note 5)                                                                         0          6,401,180 
Proceeds from shares sold: 
 Class A Shares                                                               84,809            379,004 
 Class B Shares                                                            1,148,045          1,382,294 
 Class C Shares                                                              141,421            226,771 
Payments for shares redeemed: 
 Class A Shares                                                           (1,446,321)        (3,470,274) 
 Class B Shares                                                             (572,221)        (1,277,770) 
 Class C Shares                                                             (252,953)          (680,398) 
Net asset value of shares issued in reinvestment of distributions: 
 Class A shares                                                              223,539            467,191 
 Class B shares                                                              103,531            168,229 
 Class C shares                                                               24,266             64,105 
  Net increase (decrease) in net assets resulting from capital 
  share transactions                                                        (545,884)         3,660,332 
 -------------------------------------------------------------------      -------------    --------------- 
   Total increase (decrease) in net assets                                  (331,075)         3,752,032 
 -------------------------------------------------------------------      -------------    --------------- 
Net assets: 
Beginning of period                                                       14,818,947         11,066,915 
 -------------------------------------------------------------------      -------------    --------------- 
End of period [including distributions in excess of net investment 
  income in 1996 of ($26,992) and 1995 of ($24,213)](Note 1)             $14,487,872        $14,818,947 
 ===================================================================      =============    =============== 
</TABLE>

See Notes to Financial Statements. 

<PAGE>
 
PAGE 14 
- --------------------------------- 
Keystone World Bond Fund 

NOTES TO FINANCIAL STATEMENTS 

(1.) Significant Accounting Policies 

Keystone World Bond Fund (the "Fund") is a non-diversified open-end 
registered investment company. The Fund was formed as a Massachusetts 
business trust on September 5, 1986. The Fund currently issues shares of one 
non-diversified portfolio, the World Bond Portfolio (the "Portfolio"). 
Keystone Investment Management Company (formerly Keystone Custodian Funds, 
Inc.) ("Keystone") is the Fund's Investment Adviser. The Portfolio's 
objective is to seek current income by investing primarily in a 
non-diversified portfolio consisting of debt securities denominated in United 
States and foreign currencies. The Portfolio seeks capital appreciation as a 
secondary objective. 

  Keystone is a wholly-owned subsidiary of Keystone Investments, Inc. 
(formerly Keystone Group, Inc.) ("KII"), a Delaware corporation. KII is 
privately owned by an investor group consisting predominantly of current and 
former members of management of Keystone. Keystone Investor Resource Center, 
Inc. ("KIRC"), a wholly-owned subsidiary of Keystone, is the Fund's transfer 
agent. 

  The Fund offers three classes of shares. Class A shares are offered at a 
public offering price which includes a maximum sales charge of 4.75% payable 
at the time of purchase. Class B shares are sold subject to a contingent 
deferred sales charge payable upon redemption, which decreases depending on 
when shares were purchased and how long they have been held. Class C shares 
are sold subject to a contingent deferred sales charge payable upon 
redemption within one year of purchase. Class C shares are available only 
through dealers who have entered into special distribution agreements with 
Keystone Investment Distributors Company (formerly Keystone Distributors, 
Inc.) ("KIDCO"), the Fund's principal underwriter. 

  The following is a summary of significant accounting policies consistently 
followed by the Fund in the preparation of its financial statements. The 
policies are in conformity with generally accepted accounting principles. 

A. Investments are usually valued at the closing sales price, or in the 
absence of sales and for over-the-counter securities, the mean of bid and 
asked quotations. Management values the following securities at prices it 
deems in good faith, by or under the direction of the Board of Trustees, to 
be fair: (a) securities (including restricted securities) for which complete 
quotations are not readily available and (b) listed securities if, in the 
opinion of management, the last sales price does not reflect a current value, 
or if no sale occurred. Foreign currency amounts are translated into United 
States dollars as follows: market value of investments, assets and 
liabilities at the daily rate of exchange; purchases and sales of 
investments, income and expenses at the rate of exchange prevailing on the 
dates of such transactions. Net unrealized foreign exchange gains/losses are 
a component of unrealized appreciation/depreciation of investments, foreign 
currency related transactions, and other assets and liabilities. 

  Short-term investments, if purchased with maturities of sixty days or less, 
are valued at amortized cost (original purchase price as adjusted for 
amortization of premium or accretion of discount), which, when combined with 
accrued interest, approximates market. Short-term investments maturing in 
more than sixty days for which market quotations are readily available are 
valued at current market value. Short-term investments maturing in more than 
sixty days, which are held on the sixtieth day prior to maturity, are valued 
at amortized cost (market value on the sixtieth day adjusted for amortization 
of premium or accretion of 

<PAGE>
 
PAGE 15 
- --------------------------------- 

discount), which, when combined with accrued interest, approximates market. 
All other securities and other assets are valued at fair value as determined 
in good faith using methods prescribed by the Board of Trustees. 

  Investments denominated in foreign currencies are adjusted daily to reflect 
changes in exchange rates. Market quotations are not considered to be readily 
available for long-term corporate bonds and notes; such investments are 
stated at fair value on the basis of valuations furnished by a pricing 
service, approved by the Board of Trustees, which determines valuations for 
normal, institutional-size trading units of such securities using methods 
based on market transactions for comparable securities and various 
relationships between securities which are generally recognized by 
institutional traders. 

B. Securities transactions are accounted for no later than the day following 
the trade date. Realized gains and losses are computed on the identified cost 
basis. Gains and losses on foreign currency related transactions are treated 
as ordinary income for federal income tax purposes. Interest income is 
recorded on the accrual basis and dividend income is recorded on the 
ex-dividend date. Distributions to the shareholders are recorded by the Fund 
at the close of business on the ex-dividend date. 

C. The Fund has qualified, and intends to qualify in the future, as a 
regulated investment company under the Internal Revenue Code of 1986, as 
amended ("Internal Revenue Code"). Thus, the Fund expects to be relieved of 
any federal income or excise tax liability by distributing all of its net 
taxable investment income and net taxable capital gains, if any, to its 
shareholders. The Fund intends to avoid any excise tax liability by making 
the required distributions under the Internal Revenue Code. 

D. When the Fund enters into a repurchase agreement (a purchase of securities 
whereby the seller agrees to repurchase the securities at a mutually agreed 
upon date and price), the repurchase price of the securities will generally 
equal the amount paid by the Fund plus a negotiated interest amount. The 
seller under the repurchase agreement will be required to provide securities 
("collateral") to the Fund whose value will be maintained at an amount not 
less than the repurchase price and which generally will be maintained at 101% 
of the repurchase price. The Fund monitors the value of collateral on a daily 
basis, and if the value of the collateral falls below required levels, the 
Fund intends to seek additional collateral from the seller or terminate the 
repurchase agreement. If the seller defaults, the Fund would suffer a loss to 
the extent that the proceeds from the sale of the underlying securities were 
less than the repurchase price. Any such loss would be increased by any cost 
incurred on disposing of such securities. If bankruptcy proceedings are 
commenced against the seller under the repurchase agreement, the realization 
on the collateral may be delayed or limited. Repurchase agreements entered 
into by the Fund will be limited to transactions with dealers or domestic 
banks believed to present minimal credit risks, and the Fund will take 
constructive receipt of all securities underlying repurchase agreements until 
such agreements expire. 

 Pursuant to an exemptive order issued by the Securities and Exchange 
Commission, the Fund, along with certain other Keystone funds, may transfer 
uninvested cash balances into a joint trading account. These balances are 
invested in one or more repurchase agreements that are fully collateralized 
by U.S. Treasury and/or Federal Agency obligations. 

E. In connection with portfolio purchases and sales of securities denominated 
in a foreign currency, the 

<PAGE>
 
PAGE 16 
- --------------------------------- 
Keystone World Bond Fund 

Fund may enter into forward foreign currency exchange contracts 
("contracts"). Additionally, from time to time the Fund may enter into 
contracts to hedge certain foreign currency assets. Contracts are recorded at 
market value and marked-to-market daily. Realized gains and losses arising 
from such transactions are included in net realized gain (loss) on foreign 
currency related transactions. In additon to market risk, the Fund is subject 
to the credit risk that the other party will not complete the obligations of 
the contract. 

F. The Fund distributes net investment income monthly and net capital gains, 
if any, annually. Distributions from net investment income are based on tax 
basis net income. Distributions from taxable net income can exceed book basis 
net investment income and net capital gains can exceed book basis net 
investment income and net capital gains. 

 The significant differences between financial statement amounts available 
for distribution and distributions made in accordance with income tax 
regulations are due to the deferral of losses for income tax purposes that 
have been recognized for financial statement purposes and treatment of 
foreign currency gains as ordinary income for tax purposes. 

(2.) Capital Share Transactions 

The Fund's Declaration of Trust authorizes the issuance of an unlimited 
number of shares of beneficial interest without par value. Transactions in 
shares of the Fund were as follows: 

                                      Class A Shares 
                         ------------------------------------------ 
                           Six Months Ended              Year Ended 
                             April 30, 1996        October 31, 1995 
 --------------------    ------------------    -------------------- 
Sales                           9,933                 42,522 
Redemptions                  (168,991)              (425,398) 
Shares issued in 
  acquisition of 
  Australia Income 
  Fund (Note 5)                     0                789,935 
Reinvestment of 
  dividends and 
  distributions                26,156                 57,481 
 --------------------     -----------------      ------------------ 
Net increase                 (132,902)               464,540 
 ====================     =================      ================== 

                                      Class B Shares 
                         ------------------------------------------ 
                           Six Months Ended              Year Ended 
                             April 30, 1996        October 31, 1995 
 --------------------    ------------------    -------------------- 
Sales                         132,888                166,498 
Redemptions                   (66,726)              (156,895) 
Reinvestment of 
  dividends and 
  distributions                12,073                 20,548 
 --------------------     -----------------      ------------------ 
Net increase                   78,235                 30,151 
 ====================     =================      ================== 

                                      Class C Shares 
                         ------------------------------------------ 
                           Six Months Ended              Year Ended 
                             April 30, 1996        October 31, 1995 
 --------------------    ------------------    -------------------- 
Sales                          16,471                 27,481 
Redemptions                   (29,624)               (83,800) 
Reinvestment of 
  dividends and 
  distributions                 2,840                  7,882 
 --------------------     -----------------      ------------------ 
Net decrease                  (10,313)               (48,437) 
 ====================     =================      ================== 

<PAGE>
 
PAGE 17 
- --------------------------------- 

  The Fund bears some of the costs of selling its shares under Distribution 
Plans adopted with respect to its Class A, Class B and Class C shares 
pursuant to Rule 12b-1 under the Investment Company Act of 1940 ("1940 Act"). 
Under its Distribution Plans, the Fund pays Keystone Investment Distributors 
Company (formerly Keystone Distributors, Inc.) ("KIDCO"), the principal 
underwriter and a wholly-owned subsidiary of Keystone, amounts which in total 
may not exceed each Distribution Plan's maximum. 

  The Class A Distribution Plan provides for expenditures which are currently 
limited to 0.25% annually of the average daily net asset value of Class A 
shares, to pay expenses of the distribution of Class A shares. Amounts paid 
by the Fund to KIDCO under the Class A Distribution Plan are currently used 
to pay others, such as dealers, service fees at an annual rate of up to 0.25% 
of the average daily net asset value of Class A shares maintained by such 
recipients on the Fund's books for specified periods. 

  The Class B Distribution Plans provide for expenditures at an annual rate of 
up to 1.00% of the average daily net asset value of Class B shares to pay 
expenses associated with the distribution of Class B shares. Amounts paid by 
the Fund under the Class B Distribution Plans are currently paid to KIDCO 
(which may reallow or part to others, such as dealers) (1.) as commissions 
for Class B shares sold and (2.) as shareholders service fees. KIDCO 
generally reallows a commission at the time of purchase normally equal to 
4.00% of the price paid for each Class B share sold plus the first year's 
service fee in advance in the amount of 0.25% of the price paid for each 
Class B share sold. Beginning approximately 12 months after the purchase of a 
Class B share, the dealer or other party will receive service fees at an 
annual rate of 0.25% of the average daily net asset value of such Class B 
shares maintained by such others and on the Fund's books for specified 
periods. A contingent deferred sales charge will be imposed, if applicable, 
on Class B shares purchased on or after June 1, 1995 at rates decreasing from 
a maximum of 5.00% of amounts redeemed during the first 12 months from and 
including the month of purchase to 1.00% of amounts redeemed during the 
succeeding sixth twelve-month period following the date of purchase. Class B 
shares purchased on or after June 1, 1995 that have been outstanding for 
eight years from and including the month of purchase will automatically 
convert to Class A shares without a front end sales charge or exchange fee. 
Class B shares purchased prior to June 1, 1995 will retain their existing 
conversion rights. 

  The Class C Distribution Plan provides for expenditures at an annual rate of 
up to 1.00% of the average daily net asset value of Class C shares to pay 
expenses associated with the distribution of Class C shares. Amounts paid by 
the Fund under the Class C Distribution Plan are currently paid to KIDCO 
(which may reallow all or part to others, such as dealers) (1.) as 
commissions for Class C shares sold and (2) as shareholder service fees. 
KIDCO generally reallows a commission at the time of purchase in the amount 
of 0.75% of the price paid for each Class C share sold, plus the first year's 
service fee in advance in the amount of 0.25% of the price paid for each 
Class C share sold. Beginning approximately 15 months after purchase, the 
dealer or other party will receive a commission at an annual rate of 0.75% 
(subject to applicable limitations imposed by the National Association of 
Securities Dealers, Inc.) ("NASD") and service fees at the annual rate of 
0.25%, respectively, of the average net asset value of each Class C share 
maintained by such others on the Fund's books for specified periods. 

<PAGE>
 
PAGE 18 
- --------------------------------- 
Keystone World Bond Fund 

  Each of the Distribution Plans may be terminated at any time by vote of the 
Independent Trustees or by vote of a majority of the outstanding voting 
shares of the respective class. However, after the termination of any 
Distribution Plan, at the discretion of the Board of Trustees, payments to 
KIDCO may continue as compensation for its services which had been earned 
while the Distribution Plan was in effect. 

  During the six months ended April 30, 1996, the Fund paid KIDCO $10,996 
under its Class A Distribution Plan. During the six months ended April 30, 
1996, the Fund paid KIDCO $13,348 for Class B shares sold prior to June 1, 
1995, and $7,961 for Class B Shares sold on or after June 1, 1995. The Fund 
paid KIDCO $5,976 under its Class C Distribution Plan for the six months 
ended April 30, 1996. 

  As of April 30, 1996 unpaid distribution expenses with respect to Class B 
shares purchased prior to June 1, 1995 were $231,823, and $34,179 for Class B 
shares purchased on or after June 1, 1995. As of April 30, 1996, unpaid 
distribution expenses with respect to Class C shares were $123,338. 

  Presently, the Fund's class-specific expenses are limited to Distribution 
Plan expenses incurred by a class of shares. 

(3.) Securities Transactions 

As of October 31, 1995, the Fund has a capital loss carryover for federal 
income tax purposes of approximately $1,286,000 which expires as follows: 
$472,000--2002 and $814,000--2003. Cost of purchases and proceeds from sales 
of investment securities (excluding short-term securities) for the six months 
ended April 30, 1996 were $4,008,349 and $4,051,385, respectively. 

(4.) Investment Management and Transactions with Affiliates 

Under the terms of an Investment Advisory and Management Agreement between 
Keystone and the Fund, Keystone provides investment management and 
administrative services to the Fund. In return, Keystone receives a fee, 
computed and charged to the net assets of the Fund daily, calculated at a 
rate of 1.5% of gross investment income plus an amount determined by applying 
percentage rates, which start at 0.50% and decline, as net assets increase, 
to 0.40% per annum, to the net asset value of the Fund. For the six month 
period ended April 30, 1996, the Fund paid or accrued to Keystone investment 
management and advisory fees of $47,904, which represented 0.64% of the 
Fund's average net assets. 

  For the six month period ended April 30, 1996, the Fund paid or accrued to 
KII $23,889 as reimbursement for certain accounting and printing services and 
$30,160 was paid to KIRC for transfer agent fees. 

  The Fund is subject to certain state annual expense limits, the most 
restrictive of which is as follows: 2.5% of the first $30 million of Fund 
average net assets; 2.0% of the next $70 million of Funds average net assets; 
and 1.5% of Fund average net assets over $100 million. 

  Keystone has agreed to reimburse the Fund annually for certain operating 
expenses incurred by the Fund in excess of the applicable state expense 
limit. However, Keystone is not required to make such reimbursement to an 
extent which would result in the Fund's inability to qualify as a regulated 
investment company under provisions of the Internal Revenue Code. 

<PAGE>
 
PAGE 19 
- --------------------------------- 

  The Fund has entered into an expense offset arrangement with its custodian 
bank, State Street Bank & Trust ("SSB&T"). For the six months ended April 30, 
1996, the Fund paid custody fees in the amount of $16,921 and received a 
credit of $916 pursuant to the expense offset arrangement, resulting in a 
total expense of $16,005. The assets deposited with SSB&T under the expense 
offset arrangement could have been invested in an income-producing asset. 

  Certain officers and/or Directors of Keystone are also officers and/or 
Trustees of the Fund. Officers of Keystone and affiliated Trustees receive no 
compensation directly from the Fund. Currently, the Independent Trustees of 
the Fund receive no compensation for their services. 

(5.) Fund Reorganization 

On December 30, 1994, the Fund acquired the net assets of Keystone Australia 
Income Fund in exchange for Class A Shares of the Fund pursuant to a plan of 
reorganization approved by the shareholders of Keystone Australia Income Fund 
on December 30, 1994. The acquisition was accomplished by a tax-free exchange 
of 789,935 shares of the Fund for the net assets of Keystone Australia Income 
Fund. The net assets of Keystone Australia Income Fund on that date, 
including $32,769 of unrealized depreciation on investments, were combined 
with the assets of the Fund. The aggregate net assets of the Fund and 
Keystone Australia Income Fund immediately before the acquisition were 
$10,313,320 and $6,401,180, respectively. The net assets of the Fund 
immediately after the acquisition was $16,714,500. 

(6.) Foreign Currency Exchange Contracts 

At April 30, 1996, the Fund had entered into currency exchange contracts that 
obligate the Fund to deliver currencies at specified future dates. The 
unrealized appreciation of $49,809 on these contracts is included in the 
accompanying financial statements. 

<PAGE>
 
[back cover]

                                KEYSTONE AMERICA
                                FAMILY OF FUNDS

                                   [diamond]

                      Capital Preservation and Income Fund
                           Government Securities Fund
                          Intermediate Term Bond Fund
                             Strategic Income Fund
                                World Bond Fund
                              Tax Free Income Fund
                        California Insured Tax Free Fund
                             Florida Tax Free Fund
                          Massachusetts Tax Free Fund
                             Missouri Tax Free Fund
                         New York Insured Tax Free Fund
                           Pennsylvania Tax Free Fund
                             Fund for Total Return
                           Global Opportunities Fund
                      Hartwell Emerging Growth Fund, Inc.
                                   Omega Fund
                              Fund of the Americas
                          Small Company Growth Fund II
                           Strategic Development Fund

This report was prepared primarily for the information of the Fund's
shareholders. It is authorized for distribution if preceded or accompanied by
the Fund's current prospectus. The prospectus contains important information
about the Fund including fees and expenses. Read it carefully before you invest
or send money. For a free prospectus on other Keystone funds, contact your
financial adviser or call Keystone.

[Keystone logo]  KEYSTONE
                 INVESTMENTS

                 P.O. Box 2121
                 Boston, Massachusetts 02106-2121

WBF-R-6/96
4.2M                                                    [Recycle logo]



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