21.  First, we should try our best to save the fresh water.

22.  We ought to save water, deal with polution , these is the most important thing that we should do .

23.  In one hand, we should be aware of the importance of fresh water and we should save to use fresh water.

24.  That's to say, we needn't save them or protect them.

25.  First, we must save fresh water in both our daily living and our industry.

26.  It is desirable for us to save every drop of water -- Maybe it will benefit mankind before long.

27.  So we don't consider it necessary to save water.

28.  And every one of us should save the fresh water of our world and make our world more better !

29.  Firstly, we should save fresh water when we use it; Secondly, we should find ways to make full use of the waste water.

30.  First, we must save the using of water from now.