11.  Worst of all, the water pollution make much water not be used .

12.  On one hand we must make it clear that everyone has the duty to use the water economically.

13.  First of all, we should realize the fact and call on our people to economically use fresh water.

14.  They are so plenty that people think that the fresh water can be used forever.

15.  Water can be used many times like wash hands, wash the floor and then water the flowers.

16.  With the development of industry, fresh water is used more than any time before.

17.  That means less and less fresh water can be used.

18.  it caused the use of the fresh water and the factories make production must use fresh water.

19.  the rate of production rise up and the use of fresh water increase , too, and many factories use fresh water and pollute it .

20.  Meanwhile, with the development of industry, more and more water are used widely.