It is reported that teenagers in an increasing number spent a large percentage of their free time surfing the internet and playing the computer games, which they regard as cool and fashionable. However, I hold the view that this will do great harm to them.

　　To begin with, the Internet is great cost of teenagers’ valuable time. If they used the time wasted on the Internet on their study, they would become more knowledgeable. What’s more, so much do some teenagers love playing computer games that they even think about the games in class, which will surely influence their studies. Last but not the least, not only will the surfing and playing do harm to their physical health, but also they will be bad for teenagers’ mental health.

　　As mentioned above, spending too much time on the Internet is harmful to teenagers. Therefore, teenagers are expected to stay away from the Internet and make a full use their time and energy on study.