21.  With the increasing number of population in the world, more and more fresh water is demanded.

22.  The number of the people in the earth, is rising; The water of industry is rising; pollution of water is more and more serious..

23.  The factory need more and more fresh water to improve the number of their products.

24.  With the development of the society, the global is facing with the problem of larger number of population and of promotting development of industry and agriculture.

25.  Second, we need more and more water because the number of people is increasing.

26.  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 .

27.  It is true that there are a large number of fresh water, include water of rain, water of rain , and so on.

28.  With the development of industry, a number of water has been polluted.

29.  Since this grobal is getting more and more industrialized, a great number of water is used for producing .

30.  Because the number of population is raising .