The most important drink is water.Not many people understand

The most important drink is water.Not many people understand this but it is quiet true.People can l（） for a long time without food,but they全部will die if two or three days w() water.In h() weather,many people do not drink e()water,because they don't know how much water they n().After t()exercise,people need more water.The water in the man's body is m()more than other matters(物质).We'd b() have enough water,or we may get ill.Water is necessary to all the living things.''There will be no l() if there is no water.