You must be more careful and avoid _______ the same misitakes again next time.

Don’t forget____ the door when you go out.

When I passed this afternoon ,I saw Mary lying on the grass, her handsunder her head.

The athlete seldom wears anythingother than sportswear ______the season is.

_______ you sit in front of the computer all day while working, you’d better take exercise for at least an hour every day