3、普遍真理。

e.g. Action speaks louder than words.

2、表示现在的特征或状态。

e.g. He is always ready to help others.

1、表示经常性或习惯性动作。

e.g. It seldom snows here.

40. -You know that you were driving at 100 kms an hour, don’t you？

　　 -No, officer, I _____ . This car can’t do more than 80.　

A. couldn’t have been 　　　　　　　B. may not have been

C. mustn’t have been　　　　　 　　　D. shouldn’t have been

1---5 ACDDA 6---10 BBCBD 11----15 BBBCD 16---20 CADBB

21---25 DCABC 26---30 DCCDA 31-35 DCCCD 36-40 DCBCA

39. Mary _____ have been here by now. I wonder what’s happened to her.　

A. must　　　　 B. needn’t 　　　　C. ought to 　　　　D. can’t

38. Jenny looks worried. You _____ have told her the news.　

A. can’t　　　　 B. shouldn’t 　　　　C. mustn’t 　　　　D. may not

37. If you live in a town, you _____ worry about parking.　

A. must not 　　　B. may not 　　　　C. don’t have to 　　D. should not

36. -I’m John, your friend.　

　 -Oh, but I _____ recognize you.　

A. don’t 　　　　B. can’t 　　　　　C. won’t 　　　　　D. didn’t

35. Jennie told me in her last letter that her wish _____ an artist _____ come true.　

A. became；did 　　　　　　　　　　B. becoming；would

C. becomes；has 　　　　　　　　　D. to become；had

34. -John hasn’t come yet.　

　 -Well, where _____ on such a night？

A. must he have gone　　　　　 　　　B. ought he have gone

C. could he have gone 　　　　　　　D. should he have gone