短文填空。 New York, London,Paris and other big cities are exciting places to l 1 in.There are many i 2 things to see and to do. You can go to different k__ 3 of museums and see plays and films. You can also go to s 4 to buy things from all o 5 the world. But there are many problems in big c 6 ,too. There are to many people move to cities to find jobs,and to study at good schools. But sometimes these people can't f 7 work in a good place to live i 8 Also,too many people in a small place make it hard to keep the cities safe and clean. So before peoplehave to move t_ 9 big cities,they Should think a 10 the problems of living there.