—Must we keep the window open all the time? A. No, you mustn’t B. No, you can’t. C. No, you don’t have to.
—What animal do you like best? —I like __________ best.
Huang Wei rides a bike very well. Who taught him? —No one. He taught _________.
—You won’t pass the exam ________ you don’t work hard. —OK, I’ll do my best.
—Can you play ________ piano? —No, I can’t. But I can play ________ basketball.
—Hello! This is David. Can I speak to Tom? —Yes, ___________.