New York, London, Paris and other big cities are exciting places to live in. There are many interesting things to see and to do. You can go to different kinds of museums, parks and cinemas. You can also go shopping to buy things from all over the world. But there are some problems in big cities, too. The cost of living is high, and there are too many people in some places of big cities. Every year many people move to the cities because there are some chances to find good jobs, to study at good schools, and to see good doctors. But sometimes these people cannot find work or a good place to live in. Also, too many people in a small place make it hard to keep the cities safe and clean. Some people enjoy living in big cities, but others do not. Before people move to big cities, they should think about the problems of living there.