Have they finished their homework __________?
—Have you ever been to Shanghai, Mary?—Yes. I ___________ there three times.
—How are you going to spend this weekend? —_________ the weather is fine, we’ll climb Mount Tai.
—I have no idea ____________ tell her the bad news. —I think tomorrow is the best time.
—I’m afraid I can’t ________ you, sir. Can you speak more slowly? —Of course.
—Hey, Jack. Waste paper ________ here.—Sorry, I won’t do that again.