21.  At the meantime, fresh water is polluted.

22.  Moreover, there is some water is being polluted .

23.  Industry uses more and more fresh water, and at the same time, more and more fresh water is polluted.

24.  More over , some fresh water has been polluted.

25.  Though the need of fresh water is rising, much fresh water is polluted, when factories produce their product, they put poisinous water into the river or the lake , which make fresh water polluted and then reduce it .

26.  And more and more water is being polluted.

27.  On the other hand, with the development of morden industry, more and more water are polluted.

28.  That is to say, it needs more and more fresh water and more and more fresh water will be polluted, so the problem of shortage of fresh water is very serious .

29.  And more and more fresh water is polluted.

30.  With the development of industry, much fresh water is polluted.