1.  During these years, population increased fastly , more and more fresh water are needed.

2.  With the population increasment , more and more people need fresh water.

3.  Following the development of society, the greater the industry expands, the more water is needed.

4.  People need more water for food, washing and some other everyday activities.

5.  Industry and agriculty also need fresh water.

6.  Now with the developing of industry and increasing of population, more and more fresh water is needed.

7.  In fact, with the development of the industry, more and more fresh water is needed.

8.  On the one hand, with the increasement of porpulation and the advancement of modern industry, more and more fresh water is needed, on the other hand, the water pollution is so serious that the available fresh water is Decreasing, which results in the shortage of fresh water.

9.  Not only people but also plants need fresh water.

10.  Many factors need more water and plenty of fresh water is polluted.