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B. mustn’ t C. don’ t have to D. ought not to 10. — May I smoke here? — If you _________, choose a seat in the smoking section. A. should B. could C. may D. must 11. (2021蚌埠高一檢測(cè) ) — Look! The man over there must be our headmaster. — No, it __________ be him. He has gone to Beijing. A. mustn’ t B. may not C. shouldn’ t D. can’ t 12. (2021聊城高一檢測(cè) )You cough heavily all day. I think you really __________ give up smoking. A. can B. may C. ought to D. would 13. (2021 宿州高一檢測(cè) )This is a valuable dictionary. You __________ look after it carefully and you __________ lose it. A. will。 can’ t B. should。 won’ t C. must。 mustn’ t D. must。 may not 14. She __________ into the thick forest alone on such a dark night. A. dares not go B. dares not to go C. dare not to go D. doesn’ t dare to go 15. — Must I be here tomorrow? — No, you _________. We will phone you when necessary. A. shouldn’ t B. needn’ t C. can’ t D. may not 16. (2021四川高考 ) I got close enough to hear them speaking Chinese, and I said “ Ni Hao,” just as I __________ do in China. A. must B. might C. can D. should 17. (2021江蘇高考 ) Days later, my brother called to say he was all right, but __________ say where he was. A. mustn’ t B. shouldn’ t C. wouldn’ t D. mightn’ t 18. (2021全國(guó)卷Ⅱ ) I’ m going to Europe on vacation together with John if I __________ find the money. A. can B. might C. would D. need 19. (2021新課標(biāo)全國(guó)卷 ) I __________ use a clock to wake me up because at six o’ clock each morning the