—____ do you clean your room?—Every two days.

Billy: I’ve been fixing the computer for over three hours, but it still doesn’t work. Nana: Why don’t you take a rest and try 　　　?  Maybe you’ll do better then.

-_______ do you read English books?- Three or four times a week.

The girl was flying a kite ____________ her father came back.

 I know you are shorter than your two brothers, but you run _______ of you three.