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C.must D.should19.Don’t cross the road until the traffic lights turn green. A car_______hit you.A.need B.may C.should D.must20.—Be careful! Fire ________ be dangerous sometimes. —OK. I will put it out right away.A.mustn’t B.should C.can D.needn’t21.Look at the floor, Tom! ________ you watch TV while having a meal?A.Should B.Could C.Must D.May22.—Is that Mr Zhou?—It ________ be him. He has gone to Beijing.A.can B.may C.can’t D.shouldn’t23.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.need24.— 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’t25.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.— Is the boy over there Tom? He often wears a jacket like that.— It _______ be him. He is absent from school today.A.needn’t B.shouldn’t C.mustn’t D.can’t27.When people are waiting at the zebra crossing, cars and buses ________ wait and let them go first.A.must B.may C.can D.need28.—Shall I tell him the change of the time right now?—I’m afraid you ________, otherwise he will be late for the meeting.A.can B.may C.must D.need29.To avoid ________, we’d better ________ the parents’ meeting online.A.gather。 to hold30.—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.can31.— Listen! Tom ________ be listening to the music while doing his homework.— Let’s go upstairs to remind him to turn it off.A.should B.could C.would D.must32.Cars ________ give way to walkers on some roads in Binhai, or the drivers will be fined.A.may B.will C.can D.must33.You’ve got an A in the maths test again. You ________ be good at it.A.can B.may C.must D.should34.— 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’t35.—Mum, I bought some strawberries on my way home.—Oh, you’re so sweet. But the strawberries ________ be put into the fridge for freshness.A.must B.can C.may D.need36.—Who’s the man over there? Is that Mr. Black? —It ________ be him. Mr. Black is much taller than that man.A.may B.must C.can’t D.mustn’t37.—I think they are enough. We ________ make so many chairs.—I