众所周知，课堂是每个学生实现梦想的地方，然而，有一部分同学并

众所周知，课堂是每个学生实现梦想的地方，然而，有一部分同学并没有很好地利用它。请以How should we make good use of classes?为题，写一篇文章，应包含以下要点：

1简要说明课堂的意义；

2目前课堂中存在的主要问题；

3分析原因并提出建议。

注意：

1. 可根据内容需要适当拓展，以使行文连贯；

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As we all know, class is a place where students ought to work hard to realize their dreams. However, there are some students not using class properly, making things go from bad to worse. For example, some students play mobile phones or sleep in class, wasting quantities of precious time. What's worse, some students enjoy chatting with others. Not only does it affect their own study, but also it will do harm to others.

As far as I am concerned, the main reason is that they don't realize the importance of study. To solve this problem, they have to understand making full use of class is the best way to improve the efficiency of study. After all, time waits for no man.