21.  Because of the development of the industry, more and more fresh water is being used.

22.  With the development of the parpulation and industry, more and more fresh water is used.

23.  Most of people believe that fresh water can be used for ever.

24.  They consider that fresh water can be got from the rain, the river , the will , etc. and these resources of fresh water will never dry up, so they can use fresh water freely as they want.

25.  We hope in the coming future, human beings can use fresh water more efficiently and derive enough water from our glob .

26.  As we know, May creatures drink and use fresh water.

27.  We should use fresh water when it is necessary.

28.  People always think that water can be used endlessly.

29.  Moreover, we should economize on using fresh water in our daily life.

30.  Many people believe that fresh water is never used out.