48. ------"We didn't see him at the lecture yesterday. "　　　　　　　 　　

　 ------"He _________ it. "

　 A. mustn't attend　 B. can't have attended　 C. would have not attended 　D. needed have attended

47. ---- _________ this book be yours?　　　　　　　

　 ---- No, it ________ not be mine. It ________ be his.

　 A. Can, must, may　　 B. May, might, must　　　　 C. Can, may, must 　D. Must, can, may

46. I went to the doctor's yesterday, I had to wait for half an hour before he ________ see me.

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

45.He was a good swimmer so he _________ swim to the river bank when the boat sank.

　 A. could　　 B. might　　 C. should　　 D. was able to

44.The bus _____start;I don’t know what to do with it.

　’t　 　　　　B.won’t　　 　　　　　C.shan’t　 　　　　　　　D.may not

43.--------Must I take a taxi?

　 -------No,you_____.You can walk from here.

　 A.don’t　 　　　　B.must not　 　　　　　C.don’t have to　 　　　　　D.had better not to

42.------Don’t forget to post the letter for me.

　 ------I _____.

　 A.won’t　 　　　　B.will　 　　　　　　C.don’t　　 　　　　　　’t

41.Wherever you____,there’s no place like home.

　 go　 　　　　B.must go　 　　　　　C.might go 　　　　　　D.may go

40.I can’t find Mr Wang anywhere in the office building.Where____he have gone?

　 A.may　 　　　　　　 　　　　　　　C.must　 　　　　　　　D.Should

39.Professor Wang,many students want to see you. _____they wait here or outside?

　 A.Do　 　　　　　　B.Are　 　　　　　　　C.Will　　 　　　　　　D.Shall