【正文】 ou ________ in public. It is not only to protect yourself but also to protect others.A．must B．should C．can D．need10．Exercise is helpful but it ________ be regular (規(guī)律的) exercise.A．must B．may C．can D．need11．We teenagers ________ have dreams. With dreams and hard work, anything amazing ________ be created.A．may。 can B．might。 can D．must。d better __________ hard from now on, __________ you will fail the exam.A．work。 or C．working。 or13．—Where is Tom? I am considering ________ him about the result of the exam.—Oh. You ________. He has known it already.A．to tell。t B．telling。t C．tell。t D．told。t14．— Mom, must I clean my room now?— No, you ________. You can do it after dinner.A．needn’t B．mustn’t C．shouldn’t D．can’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．When I was young, my father ___________ take me to climb the hill which was not far from our house.A．may B．must C．would D．should17．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．—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．—Will my car be ready by the end of the day?—It ________ be, sir. I’ll call if there’s any problem.A．must B．could C．shall D．should21．—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．should22．You _________ smoke here! Look at the sign. It says No smoking.A．needn39。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．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’t25．You ________ pay too much attention to protecting yourself if you plan to go abroad.A．mustn’t B．can’t C．shouldn’t D．needn’t26．—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．need27．Look at the floor, Tom! ________ you watch TV while having a meal?A．Should B．Could C．Must D．May28．Sometimes smiles _