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What do people, plants and animals have in     ? We all need water. All        things must have water to survive, whether they get it from a river, a rain cloud or a water bottle.
  water, your body would stop working properly. Water makes up more than half of your body    and a person can’t survive for more than a few days without it. Why? Your body needs water to do many important jobs. For example, your blood contains a lot of water. It     oxygen (氧气) to all the cells (细胞) of your body. Without oxygen, the cells would     and your body would stop working.
Water can also help you fight off   . You need water to digest (消化) your food and get rid of waste, too.     water is so important, you might wonder if you’re drinking enough. In fact, there is no certain amount of water that you need to drink every day.
You can help your body by drinking when you’re    and drinking extra water when the weather is hot, especially      playing sports or exercising. Then your body will be able to do all of its important jobs and you’ll feel great!