1. 选词填空。

none, that, universe, environment, out

1. （1） The population of Australia is much smaller thanof China.
   

3. （2） Some scientists believe there's life there in space．
   

5. （3） —Can you speak French，boys?

   —Sorry，of us can speak French．

7. （4） No one knows how many stars there are in the．

9. （5） We need more trees．They're good for our．