1. 用方框中所给单词的适当形式填空。

ill   possible   condition   tell   healthy

1. （1） —Shall I tell Tom the good news?

   —No, you needn't. I（tell）him already.

3. （2）  is the most important in our lives.
5. （3） Do more exercise，and you will keep away from.
7. （4） It is（possible）for humans to live on Mars at present.
9. （5） Our living in the past were very poor. We lived in a small and dark house.