【正文】 isease, we________never be too careful.A．can B．may C．must D．should20．—Will my car be ready by the end of the day?—It ________ be, sir. I’ll call if there’s any problem.A．must B．could C．shall D．should21．Sometimes smiles ________ be false, hiding other feelings like anger, fear or worry.A．should B．would C．must D．can22．—Is that Mr Zhou?—It ________ be him. He has gone to Beijing.A．can B．may C．can’t D．shouldn’t23．— 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’t24．—In China, many parents plain that their children have to stay up late to do the homework. —Don’t worry. The government has realized the problem. I’m sure there ________ be good news soon.A．can B．should C．need D．must25．—Is it usually warm in Yancheng in May??—Yes. But it _______ be rather cold sometimes.A．must B．should C．would D．can26．— 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．may27．—Seventy dollars for such a dress! You ________ be joking!—I’m serious. It’s made of silk from Hangzhou.A．must B．need C．will D．can28．—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。 has to12．Exercise is helpful but it ________ be regular (規(guī)律的) exercise.A．must B．may C．can D．need13．I ________ hear you clearly. Would you please repeat it?A．mustn’t B．can’t C．needn’t D．shouldn’t14．— Mom, must I clean my room now?— No, you ________. You can do it after dinner.A．needn’t B．mustn’t C．shouldn’t D．can’t15．If you buy your mum an iRobot floor cleaner, she ________ sweep the floor every day.A．can’t B．mustn’t C．needn’t D．shouldn’t16．Will you be back early this evening?Yes, but I ________ be a little late. Our boss sometimes has extra work for us.A．may B．must C．need D．will17．We’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．may18．—Amy, I hear you39。 should C．should。 to hold6．Hurry up, or we ________ miss the beginning of the film.A．should B．must C．may D．have to7．—There is a knock at the door.—It ________ be my mom. She always es back home at this time.A．may B．may not C．must D．can’t8．—Be careful! Fire ________ be dangerous sometimes. —OK. I