answer: #Person1# asks #Person2# what they are doing and then asks about some people in the house party.
documents: #Person1#: There are so many people in your house. What are they doing?
  #Person2#: We are having a party. I am the host and my wife is the hostess.
  #Person1#: Are they your guests?
  #Person2#: Yes, they are. They are all my friends.
  #Person1#: Who is that man?
  #Person2#: He is Professor Zhang. He is a Chinese teacher. His wife is a teacher, too. Their daughter is a college student.
  #Person1#: Who is that young man?
  #Person2#: He is her boyfriend. He is a young doctor. His name is Karl Black.