21.  It is essential that we take steps to save fresh water.

22.  Because of the short of fresh water, as a current college student, we should do: First, we should save water.

23.  I think we must pay attention not waste fresh wate and save some water when we use it.

24.  We should save fresh water by all means, such as planting , reducing pollution.

25.  If we try our best to save water, it will become richer again.

26.  Above all, we should save water.

27.  Lastly, we must improve the thought of saving water and behave ourselves by act .

28.  There are many kinds of water, such as rain, river, well and so on, so they think we needn't to save fresh water.

29.  So we can safely draw the conclusion that we must save fresh water.

30.  Fresh water is the basis of lives, whenever we should remember to save fresh water.