用所给单词的适当形式填空。    

1. We should do our best to save____    (endanger) animals.    

2. It was really              (fair) to him to ask him to do all the work.    

3. We got a ____     (science) result through lots of experiments.    

4. How do you feel about             (pollute)?    

5. The man ____      (own) a supermarket. He is the               (own) of it．