21. — You know that you were driving 100 km an hour, don't you?
— No officer, I ____. This car doesn't do more than 80.
A. may not have been
B. couldn't have been
C. mustn't have been
D. shouldn't have been
22. I think he could have joined us, but he ____
A. doesn't         B. did
C. didn't         D. couldn't
23. — Why ____ it rain now? I ____ go to the concert at 7. — What a pity!
A. can, might not         B. should, needn't       C. must, can't         D. need, mustn't
24. He was caught in the rain last night. That _____ his cold.
A. can bring about                 B. ought to bring about
C. should have brought about         D. may have brought about
25. — Did you visit the famous museum?
　 — No, we ___, but we spent too much time shopping.
A. could have visited         B. must have visited
C. can' t have visited         D. shouldn't have visited
26. — You must phone us every week.
　 — Yes, I _____.
A. must         B. have to         C. will         D. should
27. Don't throw the bottles away. They ____ in the future.
A. may need         B. are needed
C. can be needing         D. might be needed
28. English is a language that many people around the world ____ not speak perfectly but ___ at least understand.
A. may, can         B. would, might         C. will, must         D. could, might
29. — I wonder why Mr. Wang didn't attend the lecture.
　 — He ____ another one.
A. could have                 B. must have
C. might have had         D. should have had
30. He was taken away by the police. He ___ for a robber.
A. must be mistaken         B. was being mistaken
C. must mistake         D. must have been mistaken
31. — I wonder if I ____ smoke here.
　 — No, you _______. Could you see the sign "No Smoking" there?
A. can, needn't         B. shall, won’t
C. must, can't         D. may, mustn't
32. — I haven't seen Mr. White for weeks.
　 — What _____ to him?
A. must have happened         B. may have happened
C. can have happened         D. may happen
33. — I didn't go to work yesterday afternoon because my car broke down.
　 — You ________ mine. I wasn't using it.
A. might borrow              B. could have borrowed
C. can have borrowed         D. ought to borrow
34. — A man answered the phone. I suppose it was her husband.
     — It ___ her husband. He has been dead for ages.
A. mustn't be         B. couldn't have been
C. may not have been         D. mustn't have been
35. Considering that Tom always did well in all his subjects, he ____ in the final exam.
A. mustn't fail         B. couldn't have failed
C. ought not to fail         D. mustn't have failed
36. She ___ the hospital so soon, for she has not yet recovered.
A. wouldn't have left         B. shouldn't have left
C. mustn't have left                 D. didn't have to leave
37. — I promise her daughter ____ get a nice present on her birthday.
　 — Will it be a big surprise to her?
A. should         B. must         C. would         D. shall
38. — What's wrong with your pen'?
　 — The ink ____ come out.
A. can't         B. doesn't         C. hasn't         D. won' t
39. "Whatever you want, you _____ have it on condition that you get the best result." said the boss.
A. would         B. ought to         C. shall         D. could
40. Tom, you are so lazy! This work ___ hours ago.
A. should finish                 B. must have finished
C. should have been finished         D. might have finished

Keys:

1–20: ADCCB   DDABC   DDCAB   BBAAB
21–40: BCCDA   CDACD   DCBBB   BDDCC