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11.—Could I join you in the programme?—Sorry, you ________. You are too young.A.shouldn’t B.mustn’t C.can’t D.needn’t12.When you visit a museum, some instructions should ________ and we’d better not ________ them.A.pay attention to。 againstC.be paid attention to。 be against13.I ________ hear you clearly. Would you please repeat it?A.mustn’t B.can’t C.needn’t D.shouldn’t14.A lot of online resources ________ be used either by teachers at school or parents at home.A.can B.should C.need D.must15.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’t16.—The high school entrance examination is ing!—Yes, our teacher tells us we _______ be too careful while taking exams.A.mustn39。t C.needn39。t17.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.may18.—Shall we go camping this summer holiday?—Nothing________be better.A.should B.could C.must D.may19.—Will your mother be at home this Saturday?—Hard to say. She _______go to the countryside to see my grandparents.A.must B.may C.can D.would20.— Is Lang Lang going to perform at Art Center this Friday?— Yes. It ________ be him. He has been here for three days.A.might B.must C.mustn’t D.may21.—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.need22.According to the rule, used batteries ________ be dropped in the red bin for harmful wastes.A.may B.would C.should D.might23.— 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.must24.—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.Most young people like shopping online because they ________ spend much time going from shop to shop.A.needn’t B.can’t C.mustn’t D.shouldn’t27.— 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’t28.When people are waiting at the zebra crossing, cars and buses ________ wait and let them go first.A.must B.may C.can D.need29.To avoid ________, we’d better ________ the parents’ meeting online.A.gather。 hold C.gather。 to hold30.— Will dad arrive home at 6 o’