1. Sports and games .................. an important part in our lives.
A. play B. do C. take D.get
2. Reduce, reuse, recycle is said to encourage people to waste less, by using less and using things again, in order to______________ the environment.
A. Harm B. Damage C. Pollute D. Protect
3. These three Rs______________ reduce, reuse and recycle.
A. Stand up B. Stand for C. Ask for D. Means
4. Do you think robots can work longer than people______________ getting tired?
A. But B. Of C. With D. Without