一、选择题1．-Could you help me with my English homework, Nancy?-Of course I____________. Glad to help.A．could B．can C．must D．do2．Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous. A．mustn’t B．ought not to C．needn’t D．don’t ha ve to 3．Since you are very tired, you ______ finish the work today.A．needn’t B．may not C．mustn’t D．can’t4．All passengers_____ go through safety check before they take a plane.A．may B．can C．must D．need5．You______ worry about your lessons. Be careful next time and you will get a good mark. A．don’t need to B．not need C．needn’t to D．don’t need 6．—________your house be cleaned right now？—No,it needn't.It may be cleaned this afternoon．（）A．Must B．May C．Can7．—Tom, we’re going shopping at eight, right?—Yea h, but I ______ be a little late, so don’t wait for me.A．may B．should C．mustn’t8．—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 9．—Susan, someone is waiting for you on the phone. It_______ be your sister, but I’m not sure.—Oh, please tell her to call me_______ because I’m busy now.A．might; later B．must; later C．might; late D．must; late 10．— I wonder if these are Jim's glasses.—They _____his. He doesn't wear glasses.A．might be B．could be C．can't be11．—Can you come to my party on Saturday afternoon?—Sorry, I can’t. I ________ meet my friends.A．can’t B．might have to C．needn’t12．I’m sorry, children over 1.4 meters________pay the full price for the show.A．may B．must C．can D．ought to 13．—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't 14．When I write down what I am showing thanks to, it’s always for things that money______buy.A．nee dn’t B．shouldn’t C．may not D．can’t15．—The food ________be delicious . You ate it up .—You bet . My mum cooked it for me .A．must B．may C．can D．need16．Will you please________them________the Birdwatching Society?A．inviting; join B．to invite; to join C．invite; to join D．to invite; join 17．（2017 • 湖北省宜昌市中考）—Life is becoming convenient with the Internet.—That’s true! Almost everything be done online.A．must B．would C．should D．can18．—________ 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’t19．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; might20．---You look very pretty, if I say so.---Thanks a lot for saying that.A．must B．may C．will D．have to21．— Could you play the piano when you were 8 years old?— ________.A．Yes, I could B．No, I can’t C．Yes, I can D．No, I won’t 22．You should________ the teacher________being late for school.A．apology to, about B．apologize to, forC．apologies to, for D．apologize to, on【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【解析】【详解】句意：-南希，你能帮我做英语作业吗？-当然可以。
很乐意帮忙。
A. could能；B. can能； C. must必须；D. do做。
could如果是表示“可能、能够”用于一般过去时态时,回答可用could. 例如：Could he play the piano two years ago? 肯定回答Yes, he could.否定回答No, he couldn't. 如果表示“委婉、请求的语气”,回答用"can"例如：Could I use your computer? 肯定回答用Yes/Of course, you can.但不能用Yes, you could.否定回答用Sorry, you can't.不用Sorry, you couldn't 。
依据句意可知此题是表示委婉、请求的语气，故选B。
【点睛】could的用法：could如果是表示“可能、能够”用于一般过去时态时,回答可用could. 例如：Could he play the piano two years ago? 肯定回答：Yes, he could.否定回答：No, he couldn't. 如果表示“委婉、请求的语气时”,回答用"can".例如：Could I use your computer? 肯定回答可用：Yes, you can.但不能用Yes, you could.否定回答可用：Sorry, you can't.不用Sorry, you couldn't .2．A解析：A【解析】【分析】【详解】句意：看这个标志！上面写道“禁止吸烟！“你不能抽烟。
这是危险的。
mustn’t 禁止，不允许；ought not to不应该，不应当；needn’t不必；don’t have to不必。
根据“No Smoking!”可知此处禁止吸烟，所以选A。
3．A解析：A【解析】【详解】句意：既然你很累，今天就不必完成这项工作了。
A. needn’t不必；B. may not 可能不；C. mustn’t禁止；D. can’t不能。
根据上文Since you are very tired,可知，情态动词needn’t表示不需要，后面直接加动词原形。
根据题意，故选A。
4．C解析：C【解析】【详解】句意：所有乘客在乘坐飞机前必须经过安全检查。
考查情态动词辨析。
may可以，表许可或请求；can能，表能力或许可；must必须，指一定；need需要，指有必要。
根据句意语境可知，安检强调“必须，一定”，故选C。
5．A解析：A【解析】【详解】句意：你不必担心你的功课。
下次小心点，你会取得好成绩的。
考查动词need用法辨析。
need用作情态动词时常和不带to的不定式一起作谓语，否定式是将not置于其后，并有其否定的缩写形式needn't，在疑问和否定句中不加助动词；可知BCD三项表达错误。
用作行为动词时，need是一个普通的及物动词，用在肯定、否定和疑问句中均可，接不定式时要带to。
本句need用作及物动词，根据句意结构，故选A。
6．A解析：A【解析】【详解】句意：——你的房子必须现在打扫吗？——不，不必。
可以今天下午打扫。
考查情态动词辨析。
must 必须；may 可以；can 能。
根据下文回答needn't 不必，可知，上文的一般疑问句中用助动词must表示“必须”。
故选A。
【点睛】情态动词must表示“必须”，由must引起的疑问句中，肯定答语用must，否定答语用needn’t或don’t have to，表示“不必”。