修改后：
Living in the city has both advantages and disadvantages.In one hand,it is usually easier to find a job in the city and there are many means of transport that you can choose from.Besides,by living in a big city,you can go to the movies,operas and resturants whenever you want to relax.However,air pollution and frequent traffic jams are the byproducts of the conveniences provided by driving your own car.And when you walk on the street,you will always find the street to be overly crowded,noisy and dirty.What's more,you can't have a good time unless you have a high-paid job.
天上~
注：总的来说不错,除了拼写有错误,个别介词错误.