11.  With the growing of the population and the industries, more and more fresh water is required to keep up with the steps of the development.

12.  For example, the rapidly increasing population require more and more fresh water, for another example, the factories expanding quickly, they used a large number of water, to make things worsely , they polluted many water resources .

13.  The industry which has accelerated its development requires more and more water.

14.  So men require more and more fresh water in life.

15.  Because the population of the whole world increase so fast, so we require much more fresh water than ever.

16.  These years, because of the increasing population, water pollution and requiring more water used in industry, we need more and more fresh water.

17.  We know now the population is increasing, many new factories having been established and need much Fresh water, and many rivers was polluted, these lead the require of Fresh water increase, but the Fresh water is limited .

18.  On one hand, the population is increasing rapidly and they requires enough fresh water to survive.

19.  With the incease population, we require a much more fresh water than before.

20.  For another, with the development of mordern industry, factorys require the adequent water to apply the contemporary production.