【正文】 了，故選C。你可以在晚飯后做。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。這不僅是保護(hù)自己，也是保護(hù)他人。8．C解析：C【詳解】句意：——小心！火有時候會很危險。他們可以有更多的時間為旅行做準(zhǔn)備。故選C?？疾榍閼B(tài)動詞。故選A。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 ________ be at home now. He went abroad on vacation last Friday.A．can’t B．mustn’t C．needn’t D．shouldn’t33．For the safety of the passengers, objects like guns ________ be carried on board.A．may not B．needn’t C．might not D．mustn’t34．—How beautiful the winter jasmines (迎春花) are!—Yes. These goldenyellow flowers ________ be widely seen in my city in March.A．must B．can C．would D．should35．—Who’s the man over there? Is that Mr. Black? —It ________ be him. Mr. Black is much taller than that man.A．may B．must C．can’t D．mustn’t36．—________ I see your ID card? We have to check your personal information. —Sure. Here you are.A．May B．Need C．Should D．Must37．—I don’t care what people think.—Well, you _______ . Some opinions are worth weighing.A．should B．might C．could D．would38．It’s of great importance to protect the environment. Each of us ________ take an active part in it.A．can B．may C．would D．should39．—Do we