11.  It appears that we can get fresh water quite easily.

12.  People generally believe that fresh water is never used up because we human beings can get fresh water by various means.

13.  We are able to get fresh water by different means.

14.  We can get fresh water from rivers, pools and wells, even from rains.

15.  We get fresh water from various ways: rain, rivers, springs, wells.

16.  People always think that fresh water can't short because they have many way to get fresh water.

17.  People think that they can get fresh water when they want to.

18.  For instance, we can get fresh water from rain, river , lake and so forth.

19.  It is well-known that we can get fresh water from rain, river and underground.

20.  When it's raining fresh water can be got easily.