Read the following conversation and answer the question.

M: I haven't heard from my sister since last month.

W: Don't worry, Charlie. Letters from the United States can be slow sometimes.

Question: What can we learn about the man from the conversation? 

- He is anxious to see his sister.

- He wrote to his sister last month.

- He is expecting a letter from his sister.


He is expecting a letter from his sister.