阅读短文，回答问题
Hello, I'm Grace. Let me tell you something about my community (社区). It is beautiful and quiet. My house is next to a new building on Green Street. My best friend Betty lives in that building. There is a clean and big park across from Betty's building. I often go to the park to play football.
There is a music school in my community. I go there to learn to play the piano every Saturday afternoon. It's across from a bank. Is there a supermarket in my community? Of course, there is. It's between the park and the music school. Betty's mother is an assistant there. My favorite place in the community is the library. It's next to the music school. It's across from an old post office. My mother works in the post office.