Soda is popular all over the world. People, especially young children, like drinking it very much because
it tastes good. Some of them drink at least one can or bottle every day. But drinking it not only costs too
much money, but also is bad for people's health in some ways. If you drink too much soda, you will probably
become too fat, have a toothache. Even if you don't mind your money, you must at least care about your health.
     Why is soda unhealthy? A study at a university has been made for years. It shows us how bad it is. First,
soda can lower your body's PH levels. Second, soda can raise insulin levels (胰岛素水平), lead to high blood
pressure (血压), heart disease, weight gain and so on. Do you want your teeth to stop falling out? Stop
drinking soda! Do you want your bones (骨骼) to get harder? Stop drinking soda! Do you want to improve
your immune system (免疫系统)? Stop drinking soda! Do you want to lose weight? Stop drinking soda!
     But what should you drink instead? Water is good for your health. Drinking tea is a good idea, too. Anyhow, you should stop drinking soda from now on.

1. Drinking soda not only costs too much money, but also _______ people's health in some ways.
2. A study made at a university for years shows us _______.
3. Soda can lower our body's PH levels, _______ insulin levels, _______ high blood pressure, heart disease,
    weight gain and so on.
4. The writer advises us to drink _______ instead of soda.
5. The writer mainly asks us to _______.