I was used to do things by my own, because I did not like to cooperate with other person, for I thought it was so easy and quick for me to finish the job. But since I went to high school, I thought I could not do things on my own any more, I needed someone else’s help. Take the biology homework for example. The teacher asked us to do some researches and then handed in the conclusion in the next class. It took me some time to finish the research, what’s more, I did not have enough time to do all the researches, so if I cooperated with other students, we could share our researches and then made the overall conclusion. It not only saved my time, but also helped me to promote the communication with my classmate. Cooperation has the great power.