【正文】 ells us we ________ be too hardworking before the exams.A．mustn’t B．shouldn’t C．needn’t D．can’t21．—Must we stop the Japanese government discharging nuclear waste water (排放核污水) into the Pacific Ocean?—________. Because everyone should protect our earth and it is bad ________ us to eat the polluted seafood and drink the waste water.A．Yes, we can。 of B．No, we mustn’t。 of C．Yes, we must。 for D．No, we needn’t。 for22．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。t B．mustn39。t C．can D．may24．—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’t25．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．— 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’t27．You ________ pay too much attention to protecting yourself if you plan to go abroad.A．mustn’t B．can’t C．shouldn’t D．needn’t28．When people are waiting at the zebra crossing, cars and buses ________ wait and let them go first.A．must B．may C．can D．need29．—Is it really necessary for me to go shopping with a mask on?—I’m afraid you ________ in public. It is not only to protect yourself but also to protect others.A．must B．should C．can D．need30．— 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．may31．A hardworking man ________ bee a great scientist, but a great scientist ________ be a hardworking man.A．can’t。 can B．may not。 must C．can’t。 must D．may not。 can32．Cars ________ give way to walkers on some roads in Binhai, or the drivers will be fined.A．may B．will C．can D．must33．Sometimes smiles ________ be false, hiding other feelings like anger, fear or worry.A．should B．would C．must D．can34．You’ve got an A in the maths test again. You ________ be good at it.A．can B．may C．must D．should35．Mr. Black ________ be at home now. He went abroad on vacation last Friday.A．can’t B．mustn’t C．needn’t D．shouldn’t36．—Could you tell me how to renew the library books?—With pleasure. You ________ e to our desk every time. It’s easier to renew them online.A．can’t B．mustn’t C．needn’t D．shouldn’t37．—The article says that a perso