Where have you _______ all day?— I came back at noon and I _______ in this office since then.

Smoking is not allowed in public places since May 1st. It may be a good chance for some people to ______ smoking.

Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.

I get used to _______ early and going to bed early. It’s a good habit.

This is a map _____China. If you want to go traveling, you’d better take it with you. [ ]