xxDear Mary,     Thank you very much for inviting me to your party. But I regret that I will not be able to attend. Because my mother is sick, I have to do to take care of her a few days. Do not worry, she has a doctor, the disease was not serious. She will lie down on a few days healed.     In addition, thank you for the postcards, I love it. I put it above my desk, it is beautiful.      Give my。