根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺.（请在答题卡上写出完整单词）

    We all need exercise. Exercise uses up feed that we eat and keeps the body full of e____. Exercise makes your heart and muscles（肌肉） strong. Exercise also makes you feel relaxed. If you exercise several times a week, you will stay happy and h____. There are many w____ to exercise. You can walk, run, play sports or swim.

    H____, most people cannot do this. It is too far from their homes to their offices. They have no c____ but to drive to work. First, these people don't have a chance to exercise because they are sitting in their cats for two to four hours each day. Second, driving is challenging, e____ in rush hours, and needs too much attention. It makes a person t____ out. When these people arrive home after work, they don't want to take exercise.

    Some western countries, such as the United States, have problems with exercise. Many people don't have enough exercise. They have to work from morning till n____. So they don't have time to take exercise.

    Today, many people in the West are fat, which causes health problems, Doctors say exercise can help people both lose w____ and improve their health. So many people are trying to get more exercise. But it takes time to change, and when people don't see a d____ right away, they will lose heart and stop exercising.