19.--Write to me when you get home.

　 -- ________

　　 A. I must　　　 B. I should　　　　 C. I will　　　　 D. I can

18.He ______ be in his office now, because he phoned me from his home just now.

　　 A. mustn't　　　 B. needn't　　　　 C. can't　　　 　　　D. shouldn't

17. My students have taught me much, usually by asking questions that I __ answer.

　　 A. will not　　　 B. could not　　　 C. am not able to　　 D. would not

16.--Have the students started to work on their experiment?

　　 --Sorry, but I really______.

　　 A. must　　　 　B. have　　　　　 C. should　　　　　 　D. can' t

15. I promised to get there before 5 o' clock, but now the rain is pouring down. They　　　　 _________for me impatiently.

　　 A. may wait　 　　　B. ought to wait　 C. could wait　　 D. must be waiting

14.--I didn't see her yesterday.

　 --Of course, you _____, because she had gone on a trip.

　　 A. can't　　　 B. maynot have　　 C. can't have　　　　 D. mustn't have

13. Oh, what a pity. It __ so easy for me to bring those photographs I wanted to show you, but I have left them at the table at home.

　 　A. would have been　　　 B. would be　　 C. had been　　　 D. was

12. --I saw Jim at the meeting yesterday.

　　 --Did you? I think he ___ have attended, for he is an expert.

　　 A. needn't　　　　 B. mustn’t　　　　　 C. shouldn't　　　　 D. couldn't

11.The situation has become extremely tense. A war __ break out any time between the two sides.

　　 A. can　 　　B. will　　　　　 C. could　　　　　 D. must

10.--__ I tell the head teacher all that has happened?

　　 --No, you __! Mr. Xin would be terribly angry.

　 A. Will; needn't　 B. Would; can　 C. Should; mustn't　　 D. Must; don' t have to