【正文】 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。7．B解析：B【詳解】句意：——今天我必須去上學(xué)，是嗎？——不，你不必。根據(jù)“It is not only to protect yourself but also to protect others.”可知在公共場合必須戴口罩?？疾榍閼B(tài)動詞。6．A解析：A【詳解】句意：——我真的有必要帶著口罩去購物嗎？——恐怕在公共場合你必須如此。根據(jù)主句“you will be fined according to the rules.”可知，應(yīng)是如果你一定要抽的話?？疾榍閼B(tài)動詞辨析。5．D解析：D【詳解】句意：對不起，這里不允許抽煙。would將；may也許；can可能，可以；must必須。今天是最后一天。can能；may也許；would就會；should應(yīng)該；根據(jù)“It’s of great importance to protect the environment”保護(hù)環(huán)境非常重要；可知此處指“大家都應(yīng)該積極參與”，表責(zé)任、義務(wù)；故選D。我們每個(gè)人都應(yīng)該積極參與其中。故選B。shouldn’t不應(yīng)該；needn’t不必，不需要；couldn’t不可能；wouldn’t不會。瑪麗借給了我們一些錢。故選A。Could能、會（用在問句中表示委婉語氣）；Should應(yīng)該；Need需要；Must必須?！獩]問題。 mend D．need。 mending B．needed。 for D．No, we needn’t。 of B．No, we mustn’t。 must D．may not。 can B．may not。t19．You ______ pay too much attention to your pronunciation, as it is so important in the oral（口頭的） test.A．shouldn’t B．mustn’t C．can’t D．needn’t20．—The high school entrance examination is ing!— Yes, our teacher tells us we ________ be too careful while taking exams.A．mustn’t B．shouldn’t C．needn’t D．can’t21．— 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．may22．—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’t23．We39。t C．needn39。 has to12．— Is Lang Lang going to perform at Art Center this Friday?— Yes. It ________ be him. He has been here for three days.A．might B．must C．mustn’t D．may13．Exercise is helpful but it ________ be regular (規(guī)律的) exercise.A．must B．may C．can D．need14．You ________ write the report again because spelling mistakes are not allowed at all.A．must B．can C．may D．could15．I ________ hear you clearly. Would you please repeat it?A．mustn’t B．can’t C．needn’t D．shouldn’t16．A lot of online resources ________ be used either by teachers at school or parents at home.A．can B．should C．need D．must17．—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．shall18．—The high school entrance examination is ing!—Yes, our teacher tells us we _______ be too careful while taking exams．A．mustn39。 should C．should。mustn’t8．— Why didn’t you tell it to me earlier?— Why ________ I? I want to have my own secret.A．can B．may C．should D．shall9．You ________ be careful with the camera. It costs!A．can B．will C．should D．m