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Mailing letters
A：Would you please mail these letters, Lucy?
B：Yes, Sir.
A：These two are urgent letters and should be sent by registered express airmail. Others are ordinary letters.
B：All right, who should I send them to?
A：It’s sent to Mr. Charles. I believe he is in London.
B：Ok, home or office address?
A：Office address, please. He might be at work when they arrive.
B：Should I enclose this commercial paper with these two letters?
A：Yes, it’s right.
【Note】commercial paper 商业本票，商业票据