6. You can save water  turning off the tap.

5. What you do will make a difference  the

environment around you.

4. I've kept all your words  mind.

3. The station has been  use for ten years.

2. It's time  the children to go to bed.

I .根据句意，用适当的介词填空

1. After reading ihis article,your mood will change 

the better.

8. 如果可能，请早点来。

Please come earlier  .

7. 妈妈叫她儿子少看电视多锻炼。

Mother tells her son .

6. 我们应该发展环保的生活方式。

We should  .

5. 这是帮助减少污染的好方法吗？

Is it a   ?