31.  Water is needed in offices.

32.  Where else is water needed?

33.  The increasing population need more water.

34.  At the same time, industry's development made we need more water.

35.  You see, with the increase of population, we need more water with the development of industry, we also need more .

36.  The people in the earth is became more and more, every one need water .

37.  Since the water is needed so important , what shall we do to deal with it?

38.  We sit in home and whenever we need water, we can always get it.

39.  With the increasing of population, much water are needed for daily live , With the development of industry, much water are consumed every day.

40.  With the population getting great, more and more fresh water are needed for all kind of purposes.