1. 根据句意及首字母或中文提示填写单词。

1. （1） This is one of his most useful （建议）.

3. （2） He hasn't brought it back to me. （也许）he has forgotten.

5. （3） My mother was （发疯的）when Father went out angrily.

7. （4） I didn't sleep well last night, I was （醒着的）.

9. （5） Can you （想象）what life will be like in the future?