2. I learned something about   (recycle) clothes.

1. Students will   (punish) if they are often late for school.

5. We don't know these new types of   (energy) .

4. The government has   (law) to protect the rights of the young.

3. Air   (pollute) is a serious problem for people in modern society.

2. Take   (short) showers and you’ll save more water.

1. There are two   (different) in the following pictures.

10. The law does not (let sb. do sth. ) your illegal action.

9. We'd better  (分开) the new books from the old ones.

8. Water  (循环利用) is a good way to save water.