听力原文：W: Rex, can you give me a hand with one of those bags? M: Sure, Lucy. W: Could you take this one please? I didn't realize how heavy these bags would be. M: Why did you borrow so many books from the library when you have to walk back to your room from there? W: Well, I didn't intend to. Indeed, most of the books aren't mine. On my way back I met two classmates who asked me to bring their stuff as they were going to a party. And I'm also going there later, you know, after 1 drop all these bags. M: What's the occasion? W: Our professor, Prof Lee, has been on vacation for a month and we thought we'd surprise him. We're getting together for a welcome party. M: Oh, that's really thoughtful of you. W: We figure it's the least we can do for him. He's really helped me a lot with my last term paper. M: Really? That's very kind of him. W: Well, he understood how difficult it was to submit the paper by the deadline when I was in the hospital, so he granted me a month's extension. He's been such a big help to me. I thought that this might be a small way to thank him. (20)