听力原文：W: Oh, Dan. Come on in. Ive just graded the midterm exams for your class. You had one of the highest scores. So, what can I do for you? M: Dr Wilson, Im really worried about the paper due tomorrow — you know that case study. So far I havent done a thing beyond gathering the data, and I have two more midterms tomorrow morning. I was hoping youd give me an extension till Friday. W: Well, Dan, when I assigned the paper during the first week of the semester, I emphasised that late papers would be punished. Youre free to turn in your case study late, but Ill have to lower your grade for it. If I gave you extension, it wouldnt be fair to the other students. Youre a good writer, Dan. It shouldnt take that much time to turn your data into a solid report. M: But I havent even made my outline yet, and Im having a hard time with the computer analysis of the data. W: It sounds to me like youre just putting it off. M: I really am working on it, but I just cant get it finished and Ive got to study for two other tests by tomorrow afternoon! But I might be able to get it done after class...maybe...by midnight tomorrow. W: Hmm…I didnt specify what time the paper was due. But Im leaving campus at 4:00 p.m. tomorrow, and they lock this building at 11:00 p.m. M: Still, if its under your door when you get in Thursday morning, you cant say I turned it in late, right? W: Right. Questions 13 to 15 are based on the conversation you have just heard. 13. What does Dan want Dr Wilson to do? 14. What is one reason Dan gives for his problem? 15. What work has Dan already completed on the paper?13．