1. 根据句意、首字母或汉语提示写出单词, 补全句子。

1. （1） Let's help save this small tree. It has got a (疾病).

3. （2） Some forests are in danger. So people are trying to s them.

5. （3） Bremrner isn't saying  (污染) isn't a problem.

7. （4） The thieves cut a  (洞) in the fence.

9. （5） I r don't see any reason for changing it.