补全对话
Peter:Hi, Sally. Come and have a look at my photos.
Sally:Are these the photos you took in Africa, Peter?
Peter: 1 Look, this is a wildebeest. It's an animal in Africa.
Sally: 2
Peter:No, it doesn't. It only eats grass.
Sally:Are there a lot of animals in Africa?
Peter: 3
Sally:Oh, this photo looks interesting. What are you doing there?
Peter: 4
Sally:Did you have a good time there?
Peter:Ofcourse. 5
