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tructions should ________ and we’d better not ________ them.A.pay attention to。 be against16.I ________ hear you clearly. Would you please repeat it?A.mustn’t B.can’t C.needn’t D.shouldn’t17.— Zoe, what do you think is the greatest advantage of shopping online?— At least I ______ spend much time going from shop to shop.A.shouldn’t B.can’t C.needn’t D.mustn’t18.—Have you decided to take up teaching as career after graduation? —I ________ go abroad for further education instead. But it depends.A.must B.should C.may D.shall19.—Amy, I hear you39。t C.can D.may23.— 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.—Must I finish all my homework today, Mum?—No, you ________, my dear. You can finish some tomorrow if you like.A.needn’t B.shouldn’t C.can’t D.mustn’t25.—Suzy described every detail of the accident just now.—Her memory ________ be pletely back.A.shall B.need C.must D.could26.— 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.—Will Jim e to Yangzhou for a holiday?—He ________e and it depends on how much homework he will have.A.may B.should C.must D.need28.—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.must29.We teenagers ________ have dreams. With dreams and hard work, anything amazing ________ be created.A.may。 has to30.—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.need31.A hardworking man ________ bee a great scientist, but a great scientist ________ be a hardworking man.A.can’t。 can32.Look at the floor, Tom! ________ you watch TV while having a meal?A.Should B.Could C.Must D.May33.Cars ________ give way to walkers on some roads in Binhai, or the drivers will be fined.A.may B.will C.can D.must34.— 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.—How beautiful the winter jasmines (迎春花) are!—Yes. These goldenyellow flowers ________ be widely seen in my city in March.A.must B.can C.would D.should36.—Mum, I bought some strawberries on my way home.—Oh, you’re so swe