听力原文:M: Are you tired of driving? W: No, I' m fine. M: Where is 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 mm around and go back? M: Well, I guess we ought to go back, if you don' t mind. W: I'll mm off at the next road. What are there in the briefcase?