Though PE class is a part of children's education，many teenagers don't form the habit of doing exercise.As a result，they don't have interest in sports.Enthusiasm（熱情） for sports is of great importance.Young people should treat it as their part of education.
   On the one hand，as for school，increasing teenagers' enthusiasm for sports is a good way to help teenagers keep a healthy lifestyle.In the school，students are forced（強(qiáng)迫） to take exercise in the PE class by teachers.They need to join certain activities.In this way，students live in a healthy lifestyle，and they won't get sick easily.But after they leave school，no one forces them to do so，so they are lazy to take exercise.As a result，their bodies get weaker.
   On the other hand，the enthusiasm for sports is helpful for students to increase their sense of teamwork.As we known，most sports need more than one person to do，like badminton and table tennis.These sports need more than two people.When students are playing badminton，they need to cooperate，so that they can defeat others.If they just keep an eye on themselves，the game can't be played well.Doing these sports will bring students the sense of teamwork，which is important for their career.
   Teenagers should keep the habit of taking exercise.If they have enthusiasm for sports，taking exercise is a kind of happiness to them.

（1）Why don't many teenagers have interest in sports？

Because many teenagers don't form the habit of doing exercise.

Because many teenagers don't form the habit of doing exercise.

（2）What can schools do to help teenagers keep a healthy lifestyle？

Increasing teenagers' enthusiasm for sports.

Increasing teenagers' enthusiasm for sports.

（3）Who forces students to take exercise in the school？

Teachers.

Teachers.

（4）What can help students to increase their sense of teamwork？

The enthusiasm for sports.

The enthusiasm for sports.

（5）How do people feel when doing exercise if they have enthusiasm for sports？

They feel happy.

They feel happy.