The following is a complete letter. Organize it correctly. Pay attention to its layout. Note that the body of the letter has two paragraphs. 根据书信的格式要求，将下面内容填入正确的位置。 注意：只需填写正确的序号即可。 A. How pleased we were to receive your letter, which came a few days ago, particularly as I had just been released from the hospital. My previous letter was nearly my last; but after a month in bed, I'm home and about again. B. January 15, 2014 C. Yours sincerely, D. There's a lot of snow here—the streets are quite covered. It has been a very cold winter.  How is the weather in Nanjing? Do you have a lot of snow, too? I hope spring will come soon. E. Dear Su Lin, F. David (1) (2) (3) (4) (5) (6)