We are all social people. We can't live without others. Therefore,  the cooperation becomes extremely important. Maybe one can live and finish a task by himself. But it is just temporary. In a sense, it can't last for long let alone one's whole life. Where there is a person, there exist cooperation.

    For instance, in the office, we should cooperate with our colleges. In class, students are supposed to  cooperate with teacher. One tree doesn't make a forest.

One hand alone can't clap. Only  if the students and teachers work together can they work wonders. If there were only teachers giving class, the students would n't make any response. The class must be boring and noneffective. However, how  to make  the class and make the cooperation work well is worth deeply thinking. Of course, it is necessary to make full preparations for each task respectively.