听力原文:M: What did I do with my briefcase? W: Isn't it on the back seat? M: No, I don't see it. All my important papers are in it. W: You may have left it at the hotel. Should we turn around and go back? M: Well, I guess we ought to go back, if you don't mind. W: I'll turn off at the next road. What are there in the briefcase?