Questions 19 to 22 are based on the conversation you have just heard.

A．Lang Lang’s mother is a world-famous scientist.
B．Lang Lang’s father had no job before he went to Beijing.
C．Lang Lang began to learn piano when he was eight years old.
D．Lang Lang’s father is proud of him.

A．Because he can earn much money to support his family.
B．Because his wife agrees with his present working way.
C．Because his present work is creative.
D．Because his work is useful to the people and the community.