water is very important to us.we can't live without it.but some people don't really care about this.some people waste much water,some people pour the dirty water into the rivers or lakes.and, some people throw rubbish into the river. the clean water is polluted.the water that we can drink become less and less.so, we must protect the water resource.we can reuse the water to water the plants, flowers and so on. we can use the water to do many things.