1. 根据首字母提示补全单词。

1. （1） There are s boys playing soccer on the playground.

3. （2） Don't w even one drop of water, because the earth is very short of water.
   

5. （3） Humans have p their own environment themselves.

7. （4） Oh, what a m! Environment has been totally destroyed by those factories.

9. （5） What a s! Those beautiful flowers are dead because of the poisonous (有毒的)soil.