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。每处错误仅涉及一单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧),在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：1.每处错误及修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
Recently, the phenomenon of teen obesity has made a lot of parents concerning. Why are teens getting fatter and fatter?
In my opinion, there are two reasons of the problem.Firstly, because the popularity of TV and computers and students having such much homework to do, they are getting little exercise than before. Secondly, because people’s quality of life has been gotten better and better, families can afford to buy many foods, that might make the kids overweight.
In order to lose weight and stay healthy, teens should avoid spend too much time in front  of the TV or the computer and do more exercise. As the saying go, “An apple a day keeps the doctor away.” They should also eat a more balanced diet such as fruits, vegetables, less fast food and junk food. Last but not the least, they should make a proper time schedule so that they can balance their exercise and studies.