【正文】 格的。Could能、會(huì)（用在問(wèn)句中表示委婉語(yǔ)氣）；Should應(yīng)該；Need需要；Must必須。4．D解析：D【詳解】句意：我們的化學(xué)老師總是告訴我們考試前怎樣用功都不為過(guò)。故選B。做情態(tài)動(dòng)詞時(shí)，無(wú)人稱(chēng)與數(shù)的變化，且空后用動(dòng)詞原形；做實(shí)意動(dòng)詞時(shí)，有人稱(chēng)和數(shù)的變化，用dare to do sth。t B．mustn39。ll fetch them for you．A．May B．MustC．Should D．Need16．—Shall we go camping this summer holiday?—Nothing________be better.A．should B．could C．must D．may17．My bike was broken yesterday，so I____walk home． A．might B．had to C．must D．could18．—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．would19．Think twice before making a decision, or you __________ get into trouble.A．may B．can39。t C．shouldn39。 needn39。 dares climbed2．Don’t cross the road until the traffic lights turn green. A car_______hit you.A．need B．may C．should D．must3．—Be careful! Fire ________ be dangerous sometimes. —OK. I will put it out right away.A．mustn’t B．should C．can D．needn’t4．Our Chemistry teacher always tells us we ________ be too hardworking before the exams.A．mustn’t B．shouldn’t C．needn’t D．can’t5．— ________ you give me a hand? I can’t put up the poster by myself.—No problem.A．Could B．Should C．Need D．Must6．You ________ write the report again because spelling mistakes are not allowed at all.A．must B．can C．may D．could7．You39。 dares climbD．dare to say。t B．telling。t B．can39。ve got many foreign coins．_______ I have a look?—Of course, I39。 be against21．— 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’t22．According to the rule, used batteries ________ be dropped in the red bin for harmful wastes.A．may B．would C．should D．might23．You _________ smoke here! Look at the sign. It says No smoking.A．needn39。dare既可作情態(tài)動(dòng)詞，也可作實(shí)意動(dòng)詞。分析句意可知，交通燈變綠之前橫穿馬路，汽車(chē)有可能會(huì)撞到你，故此處應(yīng)用may表推測(cè)。故選C。考查情態(tài)動(dòng)詞辨析。故選A。你不必。consider doing ，第一空用telling；再由“He has known it already.”可知他已經(jīng)知道考試結(jié)果，不必再告訴他，第二空用needn39。我不能很好地聽(tīng)清楚發(fā)言者的話(huà)。它是一座巨大的建筑。t不應(yīng)該；needn39。A. may也許；B. must必須；C. need需要；D. will將，將會(huì)。C. would 將，將會(huì)（will 的過(guò)去式）。He may be at home. 他或許在家（稍有那么一點(diǎn)兒可能）?？疾榍閼B(tài)動(dòng)詞辨析。must強(qiáng)調(diào)說(shuō)話(huà)者的主觀(guān)看法，have to強(qiáng)調(diào)客觀(guān)需要?！军c(diǎn)睛】19．A解析：A【詳解】句意：做決定前要三思，否則你可能會(huì)惹上麻煩。我可以再借一段時(shí)間嗎？—— 抱歉，你不可以?？疾榍閼B(tài)動(dòng)詞辨析。24．D解析：D【詳解】句意：——聽(tīng)！湯姆一定是一邊做作業(yè)一邊聽(tīng)音樂(lè)。needn’t不必；shouldn’t不應(yīng)該；can’t不可能；mustn’t禁止。27．A解析：A【詳解】句意：——媽媽?zhuān)瑸槭裁次冶仨氁惶煜茨敲炊啻问?？——為了你的健康，你越小心越好?9．C解析：C【詳解】句意：——有人敲門(mén)。根據(jù)“Look at the floor, Tom!”可知，此處是抱怨必須吃飯看電視，用情態(tài)動(dòng)詞must。根據(jù)“or the drivers will be fined.”可知，指在濱海的一些道路上，汽車(chē)必須給行人讓路，否則司機(jī)會(huì)被罰款。你不必每次都來(lái)我們前臺(tái)。根據(jù)空后“…be widely seen”可知，這里表示這些花能夠被廣泛看到，can符合語(yǔ)境，故選B?？疾榍閼B(tài)動(dòng)詞。故選C。t沒(méi)必要