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17. “Do you think he is lazy?” “I _________ so once, but I don’t now.”

A. may have thought　　　 B. can have thought　　　

C. may think　 D. might think

16. “Is John coming by train?” “He should, but he _________ not. He likes driving his car.”

A. must　 B. can　　 C. need　 D. may

15. You _________ pay too much attention to your reading skill, as it is so important.

A. cannot　　　 B. shouldn’t　　 C. mustn’t　　　 D. needn’t

14. “Mike is often absent from class.” “Tell him he _________ answer for it if he goes on behaving like that.”

A. shall　　 B. will　　 C. would D. can

13. “I knocked on the door, but no one answered it.” “If the lights were on, he ______ at home.”

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

12. That car nearly hit me; I _________.

A. might be killed　 B. might have been killed

C. may be killed　　 D. may been killed

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

　 ---- Yes, but I think the weather office’s computers _____ be more accurate.

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

10. ---- _____ the plane have taken off on time?

　 ---- I’m afraid not. The fog was too thick then.

　 A. Can　 B. Need　 C. Must　 D. Should

9. Keep up good state of mind even if you _____ fail plenty of times.

　 A. must　 B. will　 C. can　 D. should

8. If I hadn’t stood under the ladder to catch you when you fell, you _____ now.

　 A. wouldn’t be smiling　 B. couldn’t have smiled

　 C. won’t smile　　　　 D. didn’t smile