根据对话内容，填写适当的句子，补全对话。（每小题2分，共10分）

A: ?

B: I'm reading the Old Man and the Sea by Hemingway.

A: I know why you are so good at writing stories.

B: Yes, I want to be a writer.

A: ?

B: I'm going to keep on writing stories. ?

A: My parents want me to be a doctor, but I'm not sure about that.

B: . Not everyone knows what they want to be. Just make sure you try your best. Then you can be anything you want.

A: .