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.
