【正文】 5．D解析：D【詳解】本題考查：情態(tài)動詞辨析。must 必須，一定；should 應(yīng)該，shall的過去式；may 可能；shall 應(yīng)該。但要看情況。根據(jù)“If you buy your mum an iRobot floor cleaner”可知，買了掃地機(jī)器人，就不需要人工每天掃地了，故選C?？疾榍閼B(tài)動詞辨析。故選A。needn’t不需要；mustn’t禁止；shouldn’t不應(yīng)該；can’t不能。你可以在晚飯后做。故選D。can能、會；will將要；may可以；must必須、一定。如果你一定要抽的話，你會被按規(guī)定罰款的。may可能；can可以；have to必須；need需要；根據(jù)“must we wait until the light bees green”及“That’s the traffic rule”可知，每個人都必須要遵守交通規(guī)則，應(yīng)用have to，故選C。這是交通規(guī)則。故選A。must必須；should應(yīng)該；can可以；need需要。這不僅是保護(hù)自己，也是保護(hù)他人。故選C。mustn’t禁止；should應(yīng)當(dāng)；can會、能；needn’t不需要。我馬上把火撲滅。8．C解析：C【詳解】句意：——小心！火有時候會很危險。can能夠；may可以；should應(yīng)該；shall將，會。7．C解析：C【詳解】句意：——你為什么不早點告訴我？ ——我為什么應(yīng)該告訴你？我想要保守我自己的秘密。can’t不能；needn’t不必；mustn’t禁止；may not可能不會。他們可以有更多的時間為旅行做準(zhǔn)備。根據(jù)下文“It’s a huge building”，可知不可能錯過這么大的一座建筑，ACD三項不合語境，故選B?？疾榍閼B(tài)動詞辨析。你不會錯過的。故選C。may可以；must必須（有義務(wù)、有必要）；have to不得不（客觀情況驅(qū)使）；should應(yīng)該。4．C解析：C【詳解】句意：——你覺得我的新裙子怎么樣？ ——好吧，如果我不得不說的話，它不適合你。must是情態(tài)動詞，意為“必須”，反意疑問句應(yīng)用need構(gòu)成，答語中也應(yīng)用need?？疾榍閼B(tài)動詞?！军c睛】3．B解析：B【詳解】句意：——今天我必須去上學(xué)，是嗎？——不，你不必。must一定，表示有把握的推測；may可能，表示沒有把握的推測；can可以，表示允許；would愿意，表示意愿。她可能去鄉(xiāng)下看我的祖父母。故選A。must必須；can能夠；may可以；could能夠。 for【參考答案】一、選擇題1．A解析：A【詳解】句意：你必須重新寫報告，因為根本不允許有拼寫錯誤。 of C．Yes, we must。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．may23．—Suzy described every detail of the accident just now.—Her memory ________ be pletely back.A．shall B．need C．must D．could24．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．need25．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’t26．— 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’t27．— Is the boy over there Tom? He often wears a jacket like that.— It _______ be him. He is absent from school today.A．needn’t B．shouldn’t C．mustn’t D．can’t28．— Will dad arrive home at 6 o’clock to have dinner with us this evening?— I think he will, but he ________ not. Sometimes he works extra hours.A．can B．must C．need D．may29．—Could I join you in the programme?—Sorry, you ________. You are too young.A．shouldn’t B．mustn’t C．can’t D．needn’t30．Cars ________ give way to walkers on some roads in Binhai, or the drivers will be fined.A．may B．will C．can D．must31．—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’t32．Mr. Black ________