Water is the source of life. Teachers always ask us to save as much water as possible, but most students soon forget. Humans need water to stay alive. Animals and plants need it to stay alive, too. But water is not inexhaustible. Imagine if there were no water left on earth. There would be no life. Mountains and rivers would no longer be beautiful and the world would lose its colors. Let's cherish every drop of water and make rational use of our water resources.