根据短文内容，从A,B,C三个选项中选出一个语法正确的答案。

Do you know how to keep healthy?

First, good eating habits 1 very important. Many students 2 eating junk food. Maybe it tastes good, 3 it's bad for their health. And many students only eat 4 favorite food. It's also bad for their health. It's good to eat lots of fruit and vegetables because they can help us keep 5 good health. And we should have a balanced diet(平衡膳食). It can give us lots of energy(能量) and keep our body6 .

7 , we should exercise more. 8  strong (强壮的) and healthy body comes from enough exercise. We should spend some time 9  sports every day. 

Finally, we should have good living 10 , for example, getting up and going to bed on time.