【正文】 ___. He has known it already.A．to tell。t B．telling。t C．tell。t D．told。t11．—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．— 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’t13．A lot of online resources ________ be used either by teachers at school or parents at home.A．can B．should C．need D．must14．It’s amazing that the pen ________turn voice into text with few mistakes.A．can B．must C．may D．need15．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．—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．shall17．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．My bike was broken yesterday，so I____walk home． A．might B．had to C．must D．could19．— Ready? Let’s get started, Martin.— Swimming? I just ________d better __________ hard from now on, __________ you will fail the exam.A．work。 or C．working。 or21．You’ve got an A in the maths test again. You ________ be good at it.A．can B．may C．must D．should22．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．need23．—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．need24．—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．I think all the students love the weekends because, to them, they ________ get up early on Saturdays or Sundays.A．mustn’t B．don’t need C．needn’t D．can’t26．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’t27．When people are waiting at the zebra crossing, cars and buses ________ wait and let them go first.A．must B．may C．can D．need28．— 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’t29．You ________ require others to do with the problem like you. Everyone has his own way.A．mustn