填空题
What interesting things can you see and do in big cities?
You can go to different kinds of ______ , plays and films.
填空题
Where can you buy things from all over the world in big cities?
In ______.
填空题
Why do many people move to big cities every year?
Because they want to find jobs, to study at schools, and to ______.
填空题
What's the problem if too many people live in a small space?
That makes it hard to keep the cities ______.
填空题
What should people do before they move to a big city?
They should think about the ______ of living there.