1. 根据句意及首字母提示补全单词。

1. （1） He c these watermelons with some leaves.

3. （2） Forests can help to make the air fresher. They also help to c the weather.

5. （3） We should p environment to make our cities more beautiful.

7. （4） My uncle is his pigs on the farm now.

9. （5） Trees are important. Without trees, many animals would d out.