【答案】One possible version：

Tom is a middle student now. He exercises every day. It is good for his health. He also reads books every day. He likes reading very much. He eats fruits and vegetables four or six times a week. But he has bad habits. He eats junk food every day. He often stays up late. So he sleeps less than eight hours every day. He hardly ever does housework at home. He surfs the Internet for over two hours a day. He never goes to the dentist. It is bad for his health.

【解析】这篇作文给出了写作的提纲，在写作时要构思好文章的结构，注意要点一定齐全。句子要完整，表达准确，注意时态的变化和主谓一致。文中可适当使用一些连接词来加强文章的逻辑性。