【正文】 n 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．—Is it usually warm in Yancheng in May??—Yes. But it _______ be rather cold sometimes.A．must B．should C．would D．can27．— 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．may28．—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．can29．—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．— 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’t31．You _________ smoke here! Look at the sign. It says No smoking.A．needn39。t D．mustn39。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．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’t18．—Shall we go camping this summer holiday?—Nothing________be better.A．should B．could C．must D．may19．Think twice before making a decision, or you __________ get into trouble.A．may B．can39。t C．needn39。 to mend12．I ________ hear you clearly. Would you please repeat it?A．mustn’t B．can’t C．needn’t D．shouldn’t13．A lot of online resources ________ be used either by teachers at school or parents at home.A．can B．should C．need D．must14．— Zoe, what do you think is the greatest advantage of shopping online?— At least I ______ spend much time going from shop to shop.A．shouldn’t B．can’t C．needn’t D．mustn’t15．—The high school entrance examination is ing!—Yes, our teacher tells us we _______ be too careful while taking exams．A．mustn39。 to be mendedC．don’t need。 to hold5．—How do you like my new dress? —Well, if I ________ say, it is not suitable for you.A．may B．must C．have to D．should6．—Must the children leave at six tomorrow morning?—No, they _______. They can have more time to get ready for the trip.A．can’t B．needn’t C．mustn’t D．may