【正确答案】April 16, 2011
Dear Nancy,
I'm writing to convey my thanks for your hospitality. Without your kindness, I couldn't have enjoyed my stay in Beijing so much. To my gratitude, you even guided me to view the beautiful scene of the Summer Palace and BeiHai Park. Again, please accept my heartfelt thanks for what you have done for me.
Yours sincerely,
Julia