—What are you reading about?—It’s about the one-child policy. It says that the policy has____controlling the population in China.
—Have you decided _______ to Xi’an? —Yes. I’ll go there by train. It’s much cheaper than by plane.
— Do you have any plan for this summer vacation, Mary?— Sure, I’ d like to be a volunteer and help to ______ the Central Park.
I don’t want to make friends with those people ______ think of themselves first when in trouble.
— Must I feed the goldfish now? — No, you ______. But you must do it before supper.
— Excuse me. Could you tell me ______?— Yes, and New York is the most beautiful place that I have ever lived.