补全对话。(10分) Bill: What’s that in your book, Kate? Kate:1. ______________________________. Bill: A nice room!2________________________? Kate: It is a computer on the desk. Bill: 3____________________? Kate: Yes, it’s mine. I often use(使用) it. Bill: What’s that in the bookcase? Kate: It is a model plane. Bill: Is it your model plane? Kate: No, it isn’t mine. 4.____________________________. Bill: 5.____________________________________________? Kate: It is my brother’s , too. And the tape player on the bed is mine.