—Look! There are so many people in the restaurant.
—Yes. The food there ________ be delicious.
句意：——看！餐馆里有那么多人。——是的。那里的食物一定很好吃。
考查情态动词辨析。shouldn’t不应当；can’t不能、不会；must必须、一定，表示肯定的推测；need需要。根据上句“There are so manypeople in the restaurant.”可推知，应是那里的食物一定很好吃。故选C。
—Look! There are so many people in the restaurant.
—Yes. The food there ________ be delicious.
—____________ we leave the library before 5 o'clock?
—No, you needn't. You can stay here until 5:30.
The biggest challenge weall face is to prevent further environmental disasters. We ________ take action before it is too late.
Listen up, guys!Everyone ________ wear a mask. Go and buy one if you don’t have one.
—Must I return this book before Friday, Sir?
—No, you ________,dear. You can keep it for two weeks.
You’d better take an umbrella when you go out, because it ________rain.
The man _______ be a doctor in this hospital, but I’m not sure.
—Whose notebook is this?
—It ________ be Alan’s. It looks like his.
Mary ________ go to London next year but she is not sure.
