1.If you take a walk around the city,you will find some teenagers who are overweight.
2.You might often see overweight boys and girls,which means that weight gian among young people has become a big problem.
3.I think there are two reasons why so many boys and girls overweight.
4.Some teenagers,who like to play computer games or watch TV in their time,don't do enough exercise.
5.Some other teenagers like eating in fast food restaurants which you can see everwhere in our city.
6.There is a Keep Fit Summer Camp in our city,where over weight teenagers can take exercise and learn to have a healty diet.