Thu: Hi. My names's Thu
Mary: Hi. I'm Mary
Thu: Which grade are you in?
Mary: I'm in grade 6.
Thu: And which class are you in?
Mary: 6A. What about you?
Thu: I'm in grade 7, class 7C. How many floors does your school have?
Mary: Four. It's big scholl.
Thu: My school has two floors and my classroom is on the second floor. Where's your classroom?
Mary: It's on the third floor.