11. I _______ have met him a long time ago. Both his name and face are very familiar.

　　A. may B. can

　　C. would D. should

　　13. “Shall we go shopping?” “Sorry, we _______ buy anything now because none of the shops are open.”

　　A. mustn’t B. needn’t

　　C. can’t D. shouldn’t

　　14. They often go to the restaurants for meals. They _____ be very poor.

　　A. mustn’ t B. can’t

　　C. may not D. needn’t

　　15. I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.

　　A. mustn’t B. shouldn’t

　　C. needn’t D. couldn’t

　　17. He ______ the test again, in which case, his mother will be very disappointed.

　　A. might fail B. must have failed

　　C. should fail D. could have failed

　　18. “Why didn’t she come to the meeting yesterday?” “I’m not so sure. She ______ ill.”

　　A. should be B. should have been

　　C. must be D. might have been

　　19. Why did you just sit and watch? You _______ me.

　　A. could help B. should help

　　C. could have helped D. must have helped

　　20. “You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”

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