21.  all animals and plants need water.

22.  Man also needs water.

23.  In our lives, the need of fresh water is very large, our lives need fresh wate , industry needs fresh water, and many other fields also need water .

24.  First, with the increasing of population, more and more water is needed in daily use.

25.  First, with the population increasing, more and more people need water in their everyday lives.

26.  The industry needs more water.

27.  They all need water.

28.  With the increase of the population in the world and the increase in industrial water, more and more water are needed.

29.  The number of population is great large, everyone needs fresh water !

30.  More and more factories are built, everyone needs water !