11.  With the development of industry, many factories use more fresh water than before, and these factories also give off wasted-water , so fresh water is sharply polluted.

12.  Much fresh water is polluted by humane .

13.  With the development of industority , water to be used in industry is on raise , therefore, much water is polluted and cann't be used again .

14.  One cause of this is increasingly population; another cause is more and more water used in industry; moreover, more and more Fresh water has been polluted by industry and agricature .

15.  They waste water, pollute water, and don't realize that there are many countries being short of fresh water, especially, in Africa.

16.  So many people haven't realise the importance of protect the resource of water and waste or pollute water casually.

17.  More and more fresh water is polluted by many factories.

18.  In addition, water is polluted so much by industry and agriculture so that a large amount of water is put out of use.

19.  More and more fresh water is polluted.

20.  And so much fresh water was polluted by wasted water from many factories.