11.  The most important thing is we shall save fresh water and use it efficiently.

12.  We should be conscious of saving fresh water.

13.  In a word, every people must responsible for saving water.

14.  How can we deal with the shortage of fresh water, the first thing is that we must save water .

15.  This can save much water.

16.  Personally, I think it's important for us to save water.

17.  First, I think we must strengthe to educate people, to let them know the serious situation now, to let them know the shortage of fresh water and the importance to saving water.

18.  Second, we must confine the industry using water and guide the factories to saving water as far as possible.

19.  Water shortage is a vital thing, we must save water for our survival .

20.  Facing this problem, we should save water and don't make the fresh water useless.