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Read the following passage carefully. Fill in each blank with
the correct form of the verb in the bracket. |
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It was really by accident that penicillin ___1___
( discover ) by Alexander Fleming. As a result, he ___2___
( produce ) the first of a series of antibiotics which ___3___
( be ) to ___4___ (
change ) medicine forever. While ___5___ (
conduct ) bacterial research in the laboratory, he accidentally ___6___ (
leave ) one of the cultures uncovered. Upon ___7___ (
return
) the next day, he ___8___
( find ) that it had become ___9___
( infect ) by a mould called Penicillium. Penicillin and
its derivatives ___10___
since ___10___ (
has, prove ) to be some of the most useful drugs known to man. |
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Answers |
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1. was discovered 2. produced 3. was
4. change 5. conducting 6. left
7. returning 8. found 9. infected
10. have, proved |
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It was really by accident that penicillin
was discovered by Alexander Fleming. As a result,
he produced the first of a
series of antibiotics which was
to change medicine forever.
While conducting bacterial
research in the laboratory, he accidentally
left one of the cultures
uncovered. Upon returning
the next day, he found that
it had become infected by a
mould called Penicillium. Penicillin and its derivatives
have since
proved to be some of the
most useful drugs known to man. |
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