⑴What does that man do?   

⑵Is it difficult to cook food?   

⑶Where did he work?   

⑷When did you learn to play the piano?   

⑸What is your mother?   

A. At the age of ten.

B. She's a teacher.

C. Not at all.

D. He worked in a big city.

E. He's a great scientist.