1. (2022七下·哈尔滨期中) 根据短文内容选择最佳答案

Everyone knows that exercise is important. We all need1. Doctors say it is2people. It makes you strong and smart. If you keep doing it3,you can get good grades in the exam and do homework well.

There are many ways to exercise. You can walk, run, swim, skate, or play ball games. But remember: Exercise enough, but not4. It's best to exercise5each time. Many people go to special ( 特殊的) places to exercise. People call them " healthy centers". Not only can people exercise their arms, legs and other parts of body, but also make themselves6in the restroom there. Certainly, there are some rules in these places. You can't eat in the rooms. You can't speak loudly,7. You must8the rooms clean. Some people are9, because they think there are too many rules. But I think we should follow the rules, because the rules can give us a good environment(环境)to exercise.

We10when we exercise. Friends can exercise together at a healthy center, or they can play sports together.