49.--Your language teacher looks a rather kind woman.

　　 --But in fact she is cold and hard on us. You ________ believe it!

　　 A. shouldn't　 　B. wouldn't　　　 C. mustn't　　　　　　 D. might not

48. That 　__ be Jane ringing up. k' s far too early.

　　 A. mustn't　　 B. couldn't　　　 C. wouldn't　　　　　 D. can' t

47.--Many people in England love to give advice on weather reporting.

　　 --Yes, bur I think the weather office's computers __ be more accurate(准确).

　　 A. can　　　　 B. must　　　　 C. ought to　　　　　 D. might

46.--Do you still remember when we went to the Great Wall?

　　 --I can't remember it well, but______ sometime last autumn?

　　 A. might it be　 B. must it have been　 C. could it have been　　 D. could it be

45.--I didn't go to v0ork yesterday afternoon because my car broke down.

　　 --You __ mine. I wasn't using it.

　　 A. might borrow　　　　　 B. could have borrowed　　　

C. must have borrowed　　　 D. ought to borrow

44.--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

43.--Be sure to get there on time, _____ you?

　 -- Of course , we __

　　 A. will; will　 　B. won't; shall　　　 C. don' t; do　　　 D. can; must

42.--Listen! Someone is knocking at the door.

　　 --__ be Mary. She has just been to Nanjing.

　　 A. She mustn't　　　　 　B. It can' t　　　 C. It must　　 　D. She may

41.--We didn't see him at the lecture.

　　 --Neither did anybody else. He __ it.

　　 A. maynot have attended　　　 B. must have been absent

　　 C. can' t have attended　　　　 D. couldn't have been present

40.--Is he all fight now?

　　 　--Yes. Who_______ that such a serious illness could be cured?

　　 A. has thought　　 B. had thought　　 C. was thinking 　D. would have thought