一、选择题1．—Jack must be in his office, I think.—No, he be in the office. He flew to Canada this morning.A．needn't B．shouldn't C．can't D．mustn't2．-Listen! A wolf is crying!-It _______ be a wolf, because a wolf never comes out at this time.A．mu stn’t B．needn’t C．can’t D．don’t3．— Do you think it is safe to shop online?— I think so. On Taobao, customers return goods with no questions asked，but they ______ pay delivery costs.A．can’t; can B．must; must C．can; have to D．mustn’t; can 4．The designer has tried every possible way to make the robot light, so you _____ worry about its weight.A．must B．may C．can’t D．needn’t 5．—Can we walk across the road now?—No, we . We have to wait until the light turns green.A．couldn’t B．needn’t C．shouldn’t D．mustn’t6．— Mom, I got a big box from express(快递). What is it?—I’m not sure. It ________be a present from your grandmother.A．should B．might C．must D．will7．—How nice the building is! What is it for? —It ________ a hotel. But I’m not sure. A．must be B．have to be C．may be D．can be 8．—Doesn’t Frank like staying at home and looking after his little sister?—_______, but he ________ because both of his parents work.A．Yes; has to B．No; has toC．Yes; doesn’t have to D．No; doesn’t have to9．—______ you please tell me something about the life in Canada or America?—Sorry, I______. I don’t know either. I’m from Australia.A．Could; couldn’t B．Can; couldn’t C．Could; can’t D．Can; mustn’t 10．—Must I finish my homework this evening?—No,you ________.You have a three﹣day holiday.A．won't B．mustn't C．needn't11．It is 11:00 p.m now. Peter hasn't come back yet. His mother ______ be very mad at him. A．may B．can C．must D．need 12．—Must we finish the work right now?—No, you ________. You can do it tomorrow.A．needn’t B．s houldn’t C．mustn’t D．can’t 13．—Could you please hang out with me this afternoon?—______. I have to make a plan for Clean-Up Day.A．Sorry, I couldn’t B．Sorry, I can’tC．Sure, I can D．Sure, I could14．—Must I start now?—No, you_______________.A．mustn't B．can't C．needn't D．must15．—I feel tired.—You ________ go to bed so late.A．must B．shouldn’t C．should16．— Must I finish the homework now?— .You can do it later.A．No, you needn’t B．Yes, you must C．No, you can’t17．---I heard they went skating in the mountains last winter.---It ______ true because there was little snow there.A．may not be B．won’t be C．couldn’t be D．will be 18．—The food ________be delicious . You ate it up .—You bet . My mum cooked it for me .A．must B．may C．can D．need19．—________ David be the new chairperson of the Students’ Union?—He _______ be, but I’m not sure.A．Can; can’t B．Can; mayC．May; must D．May; mustn’t20．My head teacher has made a set of rules to show what we students ________ and ________ not do in class.A．must; must B．will; willC．need; need D．might; might21．I’m sorry, children over 1.4 meters________pay the full price for the show.A．may B．must C．can D．ought to 22．—Sorry, Ms Wang. I left my homework at home. Must I hand it in today?—No, you_______ . You_______ bring it here tomorrow.A．mustn’t; should B．needn’t; must C．mustn’t; may D．needn’t; can【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【详解】句意：——我想杰克一定在他的办公室里。
——不，他不可能在办公室里。
他今天早晨飞往加拿大了。
考查情态动词。
A. needn't不需要；B. shouldn't不应该；C. can't不可能；D. mustn't表示禁止，不可以。
根据下文He flew to Canada this morning.他今天早晨飞往加拿大了，可以判断他不可能在办公室里，表示否定推测，应用can't“不可能”，故答案选C。
2．C解析：C【解析】【详解】句意：--听! 狼在叫! --它不可能是狼，因为狼从来不会在这个时候出来。
A. mustn’t禁止；B. needn’t没有必要；C. can’t不可能；D. don’t构成一般现在时的否定句。
根据“because a wolf never comes out at this t ime因为狼从来不会在这个时候出来”，可推断它不可能是狼，故选C。
【点睛】情态动词表推测的用法：can表示“可能”；can’t表示“不可能”；may表示“可能”，must表示“一定”，注意mustn’t表示“禁止”不表示推测，表示否定推测要用can’t.3．C解析：C【解析】【详解】句意：——你认为网上购物安全么？——我觉得是的。
淘宝上，消费者可以无理由退货，但是他们要承担运费。
考查情态动词辨析。
A. can’t; can不能，能；B. must; must必须，必须；C. can; have to可以，不得不；D. mustn’t; can禁止，能。
根据句意表示的是顾客能退货，是可以，第一空用can；但是不得不承担运费，非主观情愿用have to。
故选C。
4．D解析：D【解析】【分析】【详解】句意：设计者已经尝试了所有可能的方法使机器变轻，所以你不必担心它的重量。
must必须；一定；may可以；可能；can’t不能；不可能；needn’t不必，没有必要。
根据句意The designer has tried every possible way to make the robot light可知，设计者在努力使机器变轻，所以担心是没有必要的。
故应选D。
5．D解析：D【解析】【分析】句意：-我们现在能过马路了吗？-不，我们不能，我们要等到交通灯变绿。
couldn’t不能；needn’t不需要，不必；shouldn’t不应该；mustn’t禁止，不要。
根据句意We have to wait until the light turns green可知，在红灯的时候是禁止过马路的，因此这里的语气比较强，故应选D。
6．B解析：B【解析】【详解】句意：——妈妈，我从快递公司收到了一个大箱子。
它是什么？——我不确定。
可能是你祖母送的礼物。
考查情态动词。
should应该；might可能；must必须； will将，会。
根据“I’m not sure”可知下文是没有把握的肯定推测。
根据题意，故选B。
7．C解析：C【解析】【详解】句意：--这栋楼是多么好呀！它用来做什么的？--它可能是一个旅馆，我不确定。