It's our duty to save water.As we know , water is very important to man, we can't live without water. The amount of water which is suitable to drink is less and less. But some people don’t care about it . They waste a lot of water in their daily life. Even worse, they pour dirty water in to rivers. They throw rubbish into rivers , too. Many rivers and lakes are seriously polluted. Something must be done to stop the pollution. Only in this way can we live happily. If we don’t save water, the last drop of water will be a tear-drop of us.