不限词数，句子开头大小写未分
it is necessary（）each of us to do some sort of physical activity.most of us think that only overweight people need to exercise .（）this is a mistake .in fact all of us need to exercise to keep fit and active .the exercise not only helps in shaping your body ，（）provides you strengthand energy to work or study well .（）helps to keep you away from illness.
the best time to exercise is （ ）the morning .depending on your choice ，you can choose the kind of exercise that you are interested in .there （）different kinds of exercise available for you .（）you enjoy the cool fresh morning air ，you can go out for walking .walking is a kind of exercise .if you have a friend （ ）you to walk along ，then nothing is better than walking in the morning .
if you are not healthy ，it is best for you to see a doctor first and （ ）decided your exercise program .during summer time ，swimming is the right exercise of the season.
eat healthy and often exercise ，and you can keep healthy （）make your life haapy.
