Our body is an amazing object,26  If you are inactive most of the time,your body will quickly become tired when it should be active.But if you are very active,your body will get used to the hard work,and the work will become easier for you to do.

Physical activity can help people remain active and stay healthy.27  It also helps people sleep better.This is why active students don't complain about being tired.They have a good night's sleep and have the energy to study hard and have fun every day.

Physical activity also makes people look and feel good.Activity burns more calories(卡路里）than just sitting.28 In addition,regular exercise can make your muscles and bones stronger.

There are many factors to look at when you select a new physical activity.The most important is to choose something you enjoy.If you like jumping rope,that is the activity you should do.29  In fact,two days of basketball,three days of swimming,and two days of bicycling can be more fun than jogging every day. 

30  Some skills will improve with practice while others may always be difficult for you.If you enjoy an activity,feel free to do it.No one cares whether you can do it well or not,and you don't need to care about it either.

Whatever activity you choose,remain active.It can make you physically fit and healthy for life.

Everyone has heard(hear)the word"self-reliance".Emerson wrote a 41  (fame)essay about it.He felt that people should trust in their own 42  (able).They should think and act for themselves.Like many such 43  (term),this one had no real meaning for me until it was 44 

Last year I met a blind girl 45(name)Gail.She was 46  (extreme)slender and weak,but she always insisted on 47  (find)her way around the school by herself.When she 48  (sit)in a room with several of us,there was sometimes a(n)49(easy)silence,because we thought she might resent our acting too cheerful and thoughtless in her 50  (present).On such occasions, she would say something casual or show us how fast she could write.She never asked for anyone's pity.She truly relied on herself.