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.—It ________ be my mom. She always es back home at this time.A.may B.may not C.must D.can’t6.—Be careful! Fire ________ be dangerous sometimes. —OK. I will put it out right away.A.mustn’t B.should C.can D.needn’t7.Our Chemistry teacher always tells us we ________ be too hardworking before the exams.A.mustn’t B.shouldn’t C.needn’t D.can’t8.—Dad, must we wait until the light bees green? —Yes, I am afraid we ________. That’s the traffic rule.A.may B.can C.have to D.need9.—I must go to school today, ________?—No, you can go as soon as you get well.A.mustn’t I。needn’t B.needn’t I。mustn’t D.needn’t I。t make so much noise. I ________ hear the speaker very well.A.needn39。t C.shouldn39。t15.—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.—Amy, I hear you39。ll fetch them for you.A.May B.MustC.Should D.Need17.You ______ pay too much attention to your pronunciation, as it is so important in the oral(口頭的) test.A.shouldn’t B.mustn’t C.can’t D.needn’t18.My bike was broken yesterday,so I____walk home. A.might B.had to C.must D.could19.—Would you please________in that way? That’s not safe!—Sorry. I won’t do it any more.A.not driving B.not to drive C.no driving D.not drive20.Exercise is helpful but it ________ be regular (規(guī)律的) exercise.A.must B.may C.can D.need21.—The article says that a person’s animal sign decides his personality.—You ________ read it for fun, but don’t believe in that.A.can B.must C.shouldn’t D.needn’t22.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’t23.— 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’t24.—In China, many parents plain that their children have to stay up late to do the homework. —Don’t worry. The government has realized the problem. I’m sure there ________ be good news soon.A.can B.should C.need D.must25.—Is it usually warm in Yancheng in May??—Yes. But it _______ be rather cold sometimes.A.must B.should C.would D.can26.When people are waiting at the zebra crossing, cars and buses ________ wait and let them go first.A.must B.may C.can D.need27.Sometimes smiles ________ be false, hiding other feelings like anger, fear or wo