从方框中选择合适的句子补全对话，将序号写在横线上。(有多余选项)
Grandpa: What are you doing, Mike?
A. He's cooking fish soup.
Mike: 1.
B. Yes, she is.
Grandpa: Is he cooking lunch?
C. I'm helping Dad in the kitchen.
Mike: Yes, he is. 2.
D. How's the chicken, Grandpa?
Grandpa: 3.
E. Can I help you?
Mike: She's washing the tomatoes.
F. What is your sister doing?
Grandpa: Good job! Is your mum cutting chicken?
Mike: 4.
She's cooking Kung Pao Chicken.
Grandpa: Sounds great! I can't wait.
...
Mike: 5.
Grandpa: It's delicious! I love it.
解析：
1. 爷爷问Mike在做什么，Mike应回答自己正在做的事，C选项“I'm helping Dad in the kitchen.”符合。2. 爷爷问爸爸是否在做午饭，Mike回答是，接着补充爸爸在做什么，A选项“He's cooking fish soup.”合适。3. 根据Mike回答“She's washing the tomatoes.”可知爷爷问的是妹妹在做什么，F选项“What is your sister doing?”正确。4. 爷爷问妈妈是否在切鸡肉，Mike回答后说妈妈在做宫保鸡丁，所以妈妈没在切鸡肉，B选项“Yes, she is.”不符合，此处应是否定回答，但选项中无否定，可能题目设置问题，结合上下文，B选项可能为干扰项，根据后续“她在做宫保鸡丁”，推测此处应回答妈妈没在切鸡肉，但选项中没有，可能题目有误，暂按B选项处理（可能原对话中妈妈在切鸡肉后做宫保鸡丁）。5. Mike问爷爷鸡肉怎么样，D选项“How's the chicken, Grandpa?”符合，爷爷回答“很美味”。
