1.  Secondly, we should invest an amount of manpower and money in purifying polluted water.

2.  Secondly, more measures should be taken to due with the polluted water.

3.  Secondly, we have to take all measures to protect them from being polluted and try our best to make use of the polluted water lastly , we May fall on the chemical techonoly that will make us get more fresh water from oceans.

4.  Third, we must develope a new way to process the other water, for example convert the sea water into fresh water, process the polluted water before it goes to sea.

5.  They wastes water in large quatity and purse the polluted water into the rivers, and as a result, we take the water out from the river to drink .

6.  The waste water has been sent to the rivers so that the polluted water in the river is unfit to drink or use.

7.  For one thing, we can clean the polluted water in factory before draining it out.

8.  Thus, the polluted water can not be used.

9.  Secondly, we must find out a way to brighten the polluted water so we can use it.

10.  The polluted water will become useless.