Does Zhao Ping ___ his father or his mother?

—Whose T-shirt is this?—It   be John’s. It’s      small for him.

—The old man is ill. He ________ to the hospital at once.  --Don’t worry. A doctor _________to come already.

I have much work to do. I'm      busy.

-- Drugs have done great harm to some people and their families.--Quite true, so we should ________ them.