Are you in good health? 1 important for us to keep in good health. We can't study or work well without 2 healthy body. We can stay healthy in many ways. First, we should keep 3 every day. We can go to school on foot instead of 4 bus. After school, we can spend some time on ball games. If we live in a high building, we5 go upstairs or downstairs on foot. And also, we can jog( 慢跑 ), I know an 80-year-old man who has been jogging for 20 years. He almost never6 a cold or has anything wrong with his body. Second, we must remember that a good7 habit is very important. 8 we should eat more healthy food but less junk food. Third, we should go to bed early to have enough sleep. Usually adults need at least9 sleep. Teenagers need10 than eight hours.