Many people like to live in big cities, because there are a lot of interesting things to do and to see there. You can go to different kinds of museums, see plays and films. You can also buy things from all over the world. But there are serious problems in big cities, too. It is expensive to live there. Every year many people move to the cities to find jobs, to study at good schools and to receive good medical care. But sometimes these people can't find jobs or good places to live. Also it is hard to keep the cities safe and clean. Some people enjoy living in big cities. Others do not. Before people move to a big city, they should think about the problems of living there. :1. serious adj.  2. medical care 3. hard adj.  ,. Every year many people move to the cities to   _  .
find jobs receive good medical care study at good schools A, B and C