【正文】 disadvantages of having parttime jobs for college students.　　The right attitudes.　　There are many advantages for college students to take parttime jobs while they are at college. Firstly, parttime jobs will offer us students a chance to demonstrate our ability and to apply what we have learned at college. Secondly, parttime jobs help us bee more independent of our families. Thirdly, the experience we gain through parttime jobs may be of great help to our future career. Finally, parttime jobs can broaden our horizon and make our life more meaningful.　　However, a parttime job has some disadvantages. For example, we may lose time needed for sleep, rest, study, club activities and recreation. For another example, if we take parttime jobs, it is likely for us to be so interested in the work that we can’t pay attention to our study. As a result, we may fail in our school study, which will affect our future career too.　　In my opinion, as a student we should hold the right attitude towards the parttime job, for acquiring knowledge, especially more book knowledge, is our first important task. Although parttime jobs can do us some good in some aspects, we should pay more attention to school study than on it.　　　　網(wǎng)絡(luò)時(shí)代已經(jīng)到來。Keep Our City Clean　　A city, whether small or big, should be kept clean. A clean environment will do us much good. Without the clean environment, we can hardly keep fit, work efficiently or live a fortable life, which will greatly hold back the development of the city. So it’s of great importance to keep our city clean.　　Moreover, keeping the city clean is not an easy job. We can clean up the city and keep it clean temporarily, but can we keep it clean for good? This arduous work is in close relation to the economy of the city, the government policy and citizens’ qualities. It demands permanent efforts and scientific measures and right attitudes.　　In order to keep the city clean, our government has taken a great 　　many steps, which includes proper investment, making plans and regulations, the disposal of rubbish, the forestation, and the layout of gardens and flower beds and lawns. We can expect a clean and beautiful city as long s all of us do what we should under the leadership of the government.　　目前環(huán)保還存在著許多問題。Competition and Cooperation　　Competition is a very mon phenomenon in our social life today. We pete when we play games, we try to do better than others in our study and there is constant petition for jobs, fame, wealth and so forth. We can say, to some extent, petition is one of the motive force of the development of society.　　We often find petition and cooperation occurring at the same time. Think of a basketball game. During the game, one team is peting against the other, but each member of the team must cooperate with his teammates. In most cases, we can’t pete without cooperation. Thus they are equally important.　 While advocating petition, we can’t forget cooperation. In modern society, cooperation is especially important because most