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Shanghai, New York and London are all big cities. More and more people like to _______ there. There are many _______ things for people to do. People can also buy all kinds of (各种各样的) things in the world.

But there _______ many problems (问题) in big cities, too. The cost (费用) of living in big cities is very high and there is too _______ traffic in the street. _______ are there so many people in big cities? Because they want to _______ good jobs or they want to study at good _______. So it is very difficult to keep the cities quiet. Now many people like to live in the countryside. Because it’s very clean _______ quiet. Do you like living in big cities _______ in the countryside? What do you think _______ living in big cities?