1 . Experts advise that teens get 60 minutes or more of moderate(适度的)to energetic physical activity each day.    1    

Exercise benefits every part of the body, including the mind. Exercising causes the body to produce chemicals that can help a person to feel more peaceful and happy.    2    It can also help some people who have mild depression and low self-esteem. Plus, exercise can give people a real sense of success and pride at having achieved a certain goal-like beating an old time in the 100-meter dash.

Exercise can help you look better.    3    In fact, exercise is one of the most important parts of keeping your body at a healthy weight.

    4    Exercising to maintain a healthy weight cuts a person's risk of developing certain diseases, including type 2 diabetes(糖尿病)and high blood pressure. These diseases, which used to be found mostly in adults, are becoming more common in teens.

Exercise can help a person age well.    5    Women are especially prone(往往)to a condition called osteoporosis(骨质疏松症)as they get older. Studies have found that weight-bearing exercise-like jumping, running, or fast walking-can help girls(and guys) keep their bones strong.

A．The heart isn't the only organ to benefit from regular exercise.

B．People who exercise burn more calories and look stronger than those who don't.

C．Here are some of the reasons.

D．This may not seem important now, but your body will thank you later.

E．Exercise can help some people sleep better.

F．Exercise helps people lose weight and lower the risk of some diseases.

G．It's a bad idea to try to avoid fat completely, though, especially for teens.

2 . 假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文．文中共有10处语言错误，每句中最多有两处．每处错误仅涉及一个单词的增加、删除或修改．
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词．
删除：把多余的词用斜线（\）划掉．
修改：在错的词下划一横线，并在该词下面写出修改后的词．
注意：1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分．

Nowadays fewer students take exercise due to various reason and some students fall ill every now and then because of they are not healthy or strong enough． However， we should take exercise regularly to improve our health．

First of all， taking PE classes seriously． In PE classes we can build up our bodies with the careful guidance of PE teachers． Secondly， it is of great important to make it a routine to exercise after class or during breaks． In addition， it was also a good idea to join a sports club that you are interested．

As the old saying go， "The first wealth is health．" Let's do more exercise to live a better and healthy life．