从方框中选择适当的句子补全对话。(10分)
A: Who is the letter from?
B:               .
A: Does he speak Chinese?
B:           .He speaks English. But he knows a lot about China.
A:                     ?
B: Yes, he does.
A:                          ?
B: He wants to visit Beijing.
A: Oh, he can help you with your English.
B:                 .