1、2．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 are about it .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 .So wet must do something to stop the pollution .So we must protect the water as well as find ways to reuse it .It we don’t the last drop of water will be a tear-drop.