Dear(之后写上他们家庭成员的姓氏,加复扰改数衫李察,如:Smiths), I really appreciate your kind treatment during my stay in America. It is because of you that my journey is much more enjoyable. Delicious food, comfortable bedroom and nice people make me feel athome. Thanks for your kindness. I'll miss you! yours (写或茄上自己姓名)