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读一读,补全对话。 A: Hi, Jack. This is mom. 1____________________? B: I'm reading a book. A: 2_______________________________________? B: No, my sister isn't reading. She's playing. A: 3_______________________________________? B: My brother is drawing on the floor. A: 4_______________________________________? B: My father is sleeping. A: What? 5_________________________________? B: He's in the study.