According to a recent U.S. survey, children spent up to 25 hours a week ______ TV.
The chemistry teacher required the students _______ more attention _______ the lab clean.
If you are worried about the problem,you should do something it.
We’ve talked a lot _______ cars. What about trains?
We’re all going to the games.Why don’t you come ?
It was very kind of her. She insisted _______ her car to us.