1. 根据句意和所给汉语提示完成句中所缺的单词

1. （1） You'd better pay more （注意）to the way you speak when having a discussion.

3. （2） You'll never know （除非）you try.
   

5. （3） I don't know how to （提高）my reading skills
   

7. （4） The car runs at a high （速度）
   

9. （5） The teacher encourages us to take an （积极的）part in the sports meeting.