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__________ get into trouble.A.may B.can39。t C.shouldn39。t D.mustn39。t20.When you visit a museum, some instructions should ________ and we’d better not ________ them.A.pay attention to。 be against B.be paid attention。 againstC.be paid attention to。 against D.be paid attention to。 be against21.— 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’t22.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.— 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.must25.—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’t26.We39。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.may27.— 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.—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.need29.—There is a knock at the door.—It ________ be my mom. She always es back home at this time.A.may B.may not C.must D.can’t30.Look at the floor, Tom! ________ you watch TV while having a meal?A.Should B.Could C.Must D.May31.— What is that young lady’s job?— She ________ be a nurse, I’m not sure.A.must B.may C.need D.would32.Cars ________ give way to walkers on some roads in Binhai, or the drivers will be fined.A.may B.will C.can D.must33.Sometimes smiles ________ be false, hiding other feelings like anger, fear or worry.A.should B.would C.must D.can34.—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’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.—I don’t care what people think.—Well, you _______ . Some opinions are worth weighing.A.should B.might C.could D.would37.We teenagers ________ have dreams. With dreams and hard work, anyth