18. Why didnt she come to the meeting yesterday? Im 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 _______.
A. can ask, will waste
B. must have asked, had wasted
C. could have asked, was wasted
D. shouldnt have asked, would be wasted
21. Is there a flight to London this evening? There _______ be. Ill phone the airport and find it out.
A. must B. might
C. would D. can
22. Show me your permit, please. Oh, its not in my pocket. It ______.
A. might fall out B. could fall out
C. should have fallen out D. must have fallen out
23. Look at these tracks. It _______ be a wolf. Dont be so sure. I think it _______ be a fox.
A. must; could B. may; might
C. need; must D. could; need
25. Did Jim come? I dont know. He _______ while I was out.
A. might have come B. might come
C. mush have come D. should have come
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