用所给单词的适当形式填空    

1. If you're tired, why not stop____ (have)a rest?  

2. ____ (recycle) books and paper is a good way           (protect) the environment.   

3. I don't____(agree) with you.I think zoos are terrible places for animals.   

4. He is against         (put) animals in cages.   

5. People should stop____(ride)in cars and start       (ride)bikes to help save the planet.