A. Good afternoon, Helen.
B. This is Wang Bing. He's my friend.
C. Hi, Wang Bing.
D. Hi, Liu Tao.
E. Good afternoon, Liu Tao.
—_______
A. Good morning, grandpa.
B. This is my family.
C. This is me.
D. Good evening.
E. This is my mother.
F. He's my brother.