用所给单词的适当形式填空。

1. There isn't        ( someone)  at the school gate.

2. Can you see any           ( mouse)  in the room?

3. Don' t forget to turn off the light before       (go) out.

4. She is too shy, so she doesn't know what      ( say) .

5. Li Ping often helps me       ( do) my    homework .