Sarah: Welcome to our school. Look. This is the teacher's office.
Chen Jie: Wow! How big. Where is the library?
Sarah: It's on the second floor.
Chen Jie: Is that a picture on the wall?
Sarah: No, it's a map.
Chen Jie: Do you have a computer room?
Sarah: Yes, it's on the first floor. This way please.
Chen Jie: Thanks