Currently,students of high school have very heavy pressure of study.They spend all of their time on studying and even (stay up late at night),seizing their sleeping time. They also have no time to (take part in sports and activities), making their body become unhealth.Tom is one of the students. He is just a junior high school student.After he (fell ill) seriously at one time, he realize the importance of health. Now, besides (studying hard),he also does many physical (exercise)to keep himself (in good health).It is good to work hard, but we also have to (keep fit)