Water is very important to humans . We can’t live without water . The amount of water suitable to drink is falling . But some people don’t seem to care about this . They waste a lot of water They pour dirty water into rivers and pollute them . They throw rubbish into them , too . Many rivers and lakes are seriously polluted . We must do something to stop the pollution . We must protect the water as well as find ways to reuse it . If we don’t , the last drop of water will be a tear-drop .