Nancy spent half an hour _______ playing the piano every day.

My pen is missing. I can’t find it anywhere.—I’m afraid you have to buy _________.

How long have they ______ France? — For about half a year.

May I speak to the headmaster?—He’s not here．He _______ Beijing．Can I take a message?

You look tired. What’s the matter?—I cared for my sick daughter all day.