Recycling is one way to protect the environment; reusing is ________.
She reached the top of the hill and stopped ____ on a big rock by the side of the path.
The matter____ your fate cannot be taken for granted.
According to a recent U.S. survey, children spent up to 25 hours a week ____ TV.
_____such an embarrassing situation, he didn’t know what to do.
______ those troublesome messages, you’d better not give out your number to anyone whom you don’t know.