31.  We should acquire not to wasting fresh water in dialy life, control the growth of the population, protect fresh water from being polluted and try to find a way to get fresh water from the sea.

32.  We can get fresh water from everwhere , such as rain, river and so on.

33.  Usually, people think that the resource of fresh water is unlimited, because fresh water can be got from rivers, wells and so on.

34.  We can also get water from the well under the field.

35.  We can get fresh water from rain, river, well and so on.

36.  We can get fresh water from rivers and wells.

37.  They think that we can get fresh water from raining , river and under soil and so on.

38.  We often can get water from rainning , river , so many people May never worry about the shortage of the fresh water, and they often waste a lot of water in lifetime.

39.  Many people believe that fresh water is very rich, we can get water from river, lake , rain and so on.

40.  They often say, "You see, we can get fresh water from rain, river , and get it in wells.