41.  We must save fresh water at first place.

42.  We must save fresh water and use it ecnomically .

43.  To save water is important, we must use as less water as possible .

44.  Finally, many people don't save fresh water.

45.  First, we should save water and not waste every drop of water.

46.  Nowaday , saving water is called on everywhere, people think that fresh water has no end, because the scource of fresh water such as rain, river , sea, well and so on is unlimited .

47.  Under the statement , We should save water.

48.  But what's the most important is to save fresh water.

49.  On the one hand, we must save water and tell our children to do so.

50.  The most important thing for us is to save water.