Large cities are good places to live in. There are many 1 things to see and to do. You can see many cinemas, restaurants and factories. You can also go 2 to buy things from all over the world.3 there are a lot of problems （问题） in large cities. Every year many people 4 the cities to find jobs, to study at good schools. But sometimes these people can't find work or a good place to live in. There are too many people in large cities, so it is 5 to keep the cities safe and clean. Some people like living in large cities, others do not. Before people move to a large city, they 6 think about the problems of living there.
