补全对话。
A：Hello,
B：Hello, Jack.
A：I'm reading a book.
B：
A：No, she isn't. She is making her bed.
B：
A：He's working on the computer.
B：
A：Sure. Dad, there is a call for you!

A. Can I speak to him，please? B. What are you doing? C. this is Jack. D. What's your father doing? E. Is your mother reading a book, too?