用恰当的词语填空，完成对话。
L: Your sister's gone to Shanghai, 1______ she?
M: Yes.
L: How long has she been there?
M: She's been there since 2010.
L: Oh. It's about a year already! Have you 2______ from her?
M: Yes, of course. Very often. She wrote to me about a week ago and said she was quite busy there.
L: I see. Are you 3______ to write to her soon?
M: Soon? Look! I am writing a letter to her now.
L: Really? Will you please give my best 4______ to her?
M: Of course I 5______. Thank you.
