句型：This is... / Where is...? — 英语词汇题

学校开放日，Lily 带客人参观校园。请用 This is 或 Where is 补全对话（每词各用两次）：1. A: ___ the music room? B: It's on the second floor. 2. A: ___ our playground. It's big. 3. A: Excuse me, ___ the teachers' office? B: It's next to the library. 4. A: ___ our new library. Let's go and read books.