21. A good many houses _______ knocked down by the earthquake.
A. was B. were
C. is D. are
22. A good teacher must know how to _______ his ideas.
A. convey B. display
C. consult D. confront
23. A good teacher should not confront his pupils _______ too much information in one lesson.
A. by B. with
C. from D. about
24. A large part of human activity, particularly in relation to the environment, is _______ conditions or events.
A. in response to B. in favor of
C. in contrast to D. in excess of
25. A love marriage, however, does not necessarily _______ much sharing of interests and responsibilities.
A. take over B. result in
C. hold on D. keep to
26. A man escaped from the prison last night. It was a long time _______ the guards discovered what had happened.
A. before B. until
C. since D. when
27. A man has to make _______ for his old age by putting aside enough money to live on when old.
A. supply B. assurance
C. provision D. adjustment
28. A neat letter improves your chances of a favorable _______.
A. circumstance B. request
C. reception D. response
29. A new technique _______, the yields as a whole increased by 20 percent.
A. working out B. having worked out
C. having been worked out D. to have been worked out
30. A person who makes wise decisions has _______.
A. a good brain B. a good intention
C. good judgement D. good imagination
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