Dear xxx,
Haven’t heard from you for a long while.Hope you are well.
I’m writing this letter to invite you to travel in China.You have told me in our former letters you always dream of coming to China someday.I promised to offer you necessary information about China’s development and introduce wonderful places to you.
Now,there is a rare chance for you to visit China due to the coming Shanghai World Expo,which will provide a window for the world to know more about China.The Expo will last for a couple of months and attract people from all over the world to visit it.Since it can demonstrates the achievement China has made over the past decades,I’m sure you can experience a unique travelling time.
If you could come,I will treat you with Chinese delicious food.Please confirm your schedule and I’ll make arrangement.
Looking forward to your visit.Best regards.
Yours
xxx
不知道你的年级,我按照最基本的格式和话语写的,不适合的你再改改.