短文填空，根据语篇要求填空，使短文完整，意思通顺，每空一词。

Playing sports can help you keep fit. But sometimes accidents can , so try to stay safe you play them. It's necessary for you to learn about first aid. Then you can help yourselves or others if an accident happens.

Happiness is important for your health. It is the best medicine. When you are ill, try to be happy and you will feel better. On the other hand, you may feel ill you are always unhappy, So be happy to be healthy.

You must stay from smoking and drinking. Many students think it's cool to smoke and drink. But they don't know smoking or drinking can cause many illness. You should say to smoking and drinking.