打电话时如果想知道对方是谁,应该问: A. Who are you? B. Who’s that? C. Who’s this?
There __________ some meat on the plate.
—__________ you at home yesterday? —No, I ___________.
The doctor often tells him __________ more exercise.
You should ___________ your little brother when your mother is out.
Sometimes walking is __________ than driving during the busy traffic time.