—______ you please take the dog for work?
—OK, but I have tofold the clothes first.
句意：——你能带狗去上班吗?——好的，但我得先把衣服叠好。
考查情态动词。Must必须、一定；Should应该；Could能、能够，can的过去式，也可以表示委婉语气；May可以。根据下文OK, but I have to foldthe clothes first. 好的，但我得先把衣服叠好。可知上文是问“你能带狗去上班吗?”要填“could”，表示委婉语气，其它选项语意不通，故答案选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.
