题目内容：

短文填空。从方框中选择合适的单词填空，使短文通顺、连贯。

Everyone knows that exercise is     1.  . We need to exercise. Doctors say it is good    2.  us. It keeps our bodies strong.

When the daytime comes， we must     3. This is the time for exercise. Exercise means doing things with the body. There are many ways to     4. You can walk，run，swim，skate，or play ball games. Make sure you excise in the following ways: you have to    5.  what you’re doing. Exercise     6. ---but not too much. It is good to exercise    7.a week. Thirty minutes each time is enough. Try all kinds of things    8.  you find one， two or three sports that feel right for you.

Exercise can be     9. Friends can exercise   10. at fitness center， or they can play sports together. How do you exercise?