从所给出的句子中选出合适的完成对话。
A. What is your Grandpa doing?
B. Is your mother cooking?
C. Are you having a good time in Sanya?
D. She is painting a picture.
E. I'm in the living room.
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Dad: Hi, is that Betty?
Betty: Yes, it's me,Dad. How's your holiday?
Dad: Yes, I am. I am at the beach now. Where are you, Betty?
Betty:
Dad:
Betty: Yes, she is cooking dinner in the kitchen.
Dad:
Betty: He is reading a book.
Dad: How about your Grandma? What is she doing?
Betty: She's good at painting.