1 . New York, London, Paris, Tokyo and other big cities are exciting places 10 live in. There are many interesting things to see and to do. You can go to different kinds of museums, plays and films.    1    

But there are serious problems in big cities too. The cost of living is high, and there are too many people in some of big cities. Every year many people move to the cities because there are some chances to find jobs, to study at good schools, and to receive good medical care.    2    Also, too many people in a small space make it hard to keep the cities safe and clean.

Some people enjoy living in big cities.    3     Before people move to big cities, they should think about the problems of living there.