41.  We couldn't find any people there istead we saw rubbish everywhere.

42.  What's more, water pollution makes much water unfit to use any more.

43.  Thirdly we should improve the process of production in factories and they mustn't give off any dirty things in the rivers or lakes.

44.  And these water resources are never used up, so we can use fresh water without any trouble .

45.  So most of us don't think that there is any problem in using fresh water, and frequently some people waste plenty of fresh water in their daily life.

46.  In my opinion, some effective measures should be carried out without any delay.

47.  I think that we must do any things .

48.  With the development of economy, population is also increasing, even faster than supplies of fresh water and any other sources.

49.  On the other hand, everyone should protect fresh water from being polluted, and value any drops of fresh water.

50.  We should use fresh water efficently , and not waste any fresh water.