铅笔的主人是谁？
Li Yan: Hello, Peter. I find(找到) a yellow pencil. Is this yours?
Peter: No, it isn’t. My pencil is red. Maybe it’s Tom’s.
Li Yan: Hello, Tom. Is this your pencil?
Tom: No. I only have one pencil. I’m using it now. You can ask Bob.
Li Yan: Hi, Bob. Is this your pencil?
Bob: Yes. Thank you.
Li Yan: You’re welcome.