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. must D. may 6. You________buy a gift, but you can if you want to. A. must B. mustn’ t C. have to D. don’ t have to 7. I have told you the keep repeating it? A. Must B. Can C. May D. Will 8. I________have watched that movie—it’ ll give me horrible dreams. A. shouldn’ t B. needn’ t C. couldn’ t D. mustn’ t 9. —________I take the book out? —I’ m afraid not. A. Will B. May C. Must D. Need 10. Just be the world to change so soon. A. can’ t B. needn’ t C. may not D. will not 11. He must be helping the old man to water the flowers, ________? A. is he B. isn’ t he C. must he D. mustn’ t he 12. He was determined that his children ________ to the best school available. A. should go B. went C. ought to go D. would go 13. We hope that as many people as possible ________ join us for the piic tomorrow. A. need B. must C. should D. can 14. Since you have made such good preparations, there ________ be any problem about passing the ing exam. A. mustn’ t B. shan’ t C. shouldn’ t D. needn’ t 15. —The woman biologist had stayed in Africa studying wild