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.must B.may C.can D.would20.I ________ hear you clearly. Would you please repeat it?A.mustn’t B.can’t C.needn’t D.shouldn’t21.Look at the floor, Tom! ________ you watch TV while having a meal?A.Should B.Could C.Must D.May22.According to the rule, used batteries ________ be dropped in the red bin for harmful wastes.A.may B.would C.should D.might23.You _________ smoke here! Look at the sign. It says No smoking.A.needn39。t B.mustn39。t C.can D.may24.—Suzy described every detail of the accident just now.—Her memory ________ be pletely back.A.shall B.need C.must D.could25.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.need26.— Mum, why do I have to wash hands so many times a day?—You ________ be too careful, for your health.A.can’t B.mustn’t C.may not D.needn’t27.—Is it usually warm in Yancheng in May??—Yes. But it _______ be rather cold sometimes.A.must B.should C.would D.can28.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’t29.To avoid ________, we’d better ________ the parents’ meeting online.A.gather。 hold B.gathering。 hold C.gather。 holding D.to gather。 to hold30.—Must we stop the Japanese government discharging nuclear waste water (排放核污水) into the Pacific Ocean?—________. Because everyone should protect our earth and it is bad ________ us to eat the polluted seafood and drink the waste water.A.Yes, we can。 of B.No, we mustn’t。 of C.Yes, we must。 for D.No, we needn’t。 for31.— What is that young lady’s job?— She ________ be a nurse, I’m not sure.A.must B.may C.need D.would32.— Excuse me. I haven’t finished reading the book yet. May I keep it a bit longer?— Sorry, you ________. You must return it on time.A.needn’t B.can’t C.won’t D.shouldn’t33.Sometimes smiles ________ be false, hiding other feelings like anger, fear or worry.A.should B.would C.must D.can34.You’ve got an A in the maths test again. You ________ be good at it.A.can B.may C.must D.should35.— The sandstorm in Beijing is so serious this year.— Yes, I wonder when we ________ worry about the air we breathe.A.can’t B.mustn’t C.needn’t D.shouldn’t36.—Could you tell me how to renew the library books?—With pleasure. You ________ e to our desk every time. It’s easier to renew them online.A.can’t B.mustn’t C.needn’t D.shouldn’t37.—The article says that a person’s animal sign decides his