---What’s your favorite subject?---________, because I am interested in numbers.
—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, ___________.