. it's our duty to save water. we should stop factories from pouring waste water into the river. we should plant trees in order to keep soil. if we don't save water, the last drop of water will be our tear.

　　the most important question in the world is pollution, but we know water, like air is very important to living things because all animals and plants need water. we, like fish can't live without water. we need it to drink, cook, and clean ourselves. we need clean fresh water, but we are polluting the lakes and rivers. our drinking water is becoming less and less. if we continue to do things like this, we shall destroy ourselves.

　　i think we should follow the rules. don't throw food away. we try to make a good habit. i know it's our duty to save water. so we should save water and protect eh environment.

　　now water pollution is the most serious problem. we can't live without water. water is life. so i think

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