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owed at all.A.must B.can C.may D.could9.—There is a knock at the door.—It ________ be my mom. She always es back home at this time.A.may B.may not C.must D.can’t10.I ________ hear you clearly. Would you please repeat it?A.mustn’t B.can’t C.needn’t D.shouldn’t11.— Why didn’t you tell it to me earlier?— Why ________ I? I want to have my own secret.A.can B.may C.should D.shall12.If you buy your mum an iRobot floor cleaner, she ________ sweep the floor every day.A.can’t B.mustn’t C.needn’t D.shouldn’t13.Please don39。t make so much noise. I ________ hear the speaker very well.A.needn39。t C.shouldn39。t14.The boy is very brave.I ________ he ________ the tall tree.A.dare say。 dare climbingC.dare saying。 dares climbed15.—The high school entrance examination is ing!—Yes, our teacher tells us we _______ be too careful while taking exams.A.mustn39。t C.needn39。t16.We’ve discussed every detail of this plan and have got everything ready. But still something __________ go wrong. We still have to be very careful.A.must B.should C.would D.may17.—Amy, I hear you39。ll fetch them for you.A.May B.MustC.Should D.Need18.When I was young, my father ___________ take me to climb the hill which was not far from our house.A.may B.must C.would D.should19.—Shall we go camping this summer holiday?—Nothing________be better.A.should B.could C.must D.may20.You39。 and B.working。 and D.work。t B.mustn39。ve discussed every detail of this plan and have got everything ready. But still something ________ go wrong. We still have to be very careful.A.must B.should C.would D.may24.Never throw objects from the building. Even a small object ________ cause serious injuries, or death, when dropped from a great height.A.must B.should C.may D.need25.I think all the students love the weekends because, to them, they ________ get up early on Saturdays or Sundays.A.mustn’t B.don’t need C.needn’t D.can’t26.You ________ pay too much attention to protecting yourself if you plan to go abroad.A.mustn’t B.can’t C.shouldn’t D.needn’t27.—Seventy dollars for such a dress! You ________ be joking!—I’m serious. It’s made of silk from Hangzhou.A.must B.need C.will D.can28.Look at the floor, Tom! ________ you watch TV while having a meal?A.Should B.Could C.Must D.May29.—Be careful! Fire ________ be dangerous sometimes. —OK. I will put it out right away.A.mustn’t B.should C.can D.needn’t30.Mr. Black ________ be at home now. He went abroad on vacation last Friday.A.can’t B.mustn’t C.needn’t D.shouldn’t31.A hardworking man ___