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roblem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.A. shan’t B. can’t C. needn’t D. mustn’t12. The teacher _______ have thought Johnson was worth it or she wouldn’t have wasted time on his, I suppose.A. should B. can C. would D. must13. In crowded places like airports and railway stations, you _____ take care of your luggage.A. can B. may C. must D. will 14. My MP4 player isn’t in my bag. Where_____ I have put it?A. can B. must C. should D. would 15. — What does the sign over there read? — “ No person _______ smoke or carry a lighted cigarette, cigar or pipe in this area.A. will B. may C. shall D must16. — What do you think we can do for our aged parents? — You _____ do anything except to be with them and be yourself.A. don’t have to B. oughtn’t to C. mustn’t D. can’t17. — She looks very happy. She _____ have passed the exam. — I guess so. It is not difficult after all.18. — Where is my dictionary? I remember I put it here yesterday. — You _____ it in the wrong place.A. must put B. should have put C. might put D. might have put.19. — What is the name? — Khulaifi. ______ I spell that for you?A. Shall B. Would C. Can D. Might20. We ______ have proved great adventurers, but we have done the greatest march ever made in the past ten years.A. needn’t B. may not C. shouldn’t D. mustn’t21.— I think I will give Bob a ring. —You ______. You have not been in touch with him for ages.A. will B. may C. have to 22.— Could I have a word with you, mum? — Oh dear, if you _____.A. can B. must C. may D. should23. If it were not for the fact that she _____ sing, I would invite her to the party.A. couldn’t B. shouldn’t C. can’t D. might not24. — Must he e to sign this paper himself? — Yes, he_____.A. need B. must C. may D. will25. Some aspects of a pilot’s job ______ be boring, and pilots often _____ work at inconvenient hours.A. can。 have to B. may。 may D. ought to。 otherwise, he wouldn’t be enjoying himself by the seaside.A. should B. must C. wouldn’t D. can’t32. I ______ have been more than six years old when the accident happened.A. shouldn’t B. couldn’t C. mustn’t D. needn’t33. I was on the highway when this car went past followed by a police car. They ____ at least 150 kilometers an hour.A. should have been doing B. must have been doing C. could have done D. would have done34. — The woman biologist stayed in Africa studying wild animals for 13 years before she returned.A. may go through B. might go through C. ought to have gone through D. must have gone through35. The World Wide Web i