answer: #Person1#'s worried that #Person1#'s son might fall behind in Chinese because they'll go to London for two months. Miss Smith suggests that more Chinese homework may be helpful.
documents: #Person1#: Good morning, Miss Smith. I'm sorry to trouble you.
  #Person2#: Good morning, not at all. Please be seated. What can I do for you?
  #Person1#: It's about my son.
  #Person2#: He isn't in trouble. I hope he's doing well in all his lessons. He'll do well in the exams.
  #Person1#: Except in Chinese. I'm afraid. He says that he is a little weak in Chinese.
  #Person2#: Is he? I'm sorry to hear that.
  #Person1#: That's why I've come to see you. I'm worried about his Chinese. He may fall behind the others when he comes back.
  #Person2#: What do you mean?
  #Person1#: We'll go back to London for a holiday for two months. We haven't been back for three years.
  #Person2#: I see. I think that maybe his Chinese teacher can give him some homework to do during the holiday. He won't fall too far behind the others when he comes back.