21. He was very busy yesterday; otherwise he___ to the meeting.

A. would have ***e B. would ***e C. could ***e D. had ***e

22. You can't hear what I'm saying ____ you stop talking.

A. only if B. unless C. lest D. except that

23. Sorry I can't answer your question. I know____ about the subject.

A. a little B. some C. little D. few

24. I ____ get this done immediately or it will be too late.

A. must B. can C. may D. might

25. He____ working till he was seventy years old.

A. kept up B. kept on C. kept to D. kept out

26. You ought to take every___ of improving your English.

A. time B. thing C. chance D. case

27. ____ from space, our earth, with water covering 70% of its surface, appears as a "blue pla***".

A. Seen B. Seeing C. To be seen D. Having seen

28. The novel ended happily, and the young couple was married____.

A. in the final B. in the end C. 'to the last D. in conclusion

29. The building___ mostly undamaged after the earthquake, and only minor repairs were necessary.

A. discovered B. lasted C. consisted D. remained

30. He is an honest official and never any gifts from people who sought his help.

A. received B. accepted C. expected D. took up

答案：

21-25 ABCAB 26-30 CABDB