Dear Mary,How is it going?I will marry Davy on July 12th and a small party in honor of our wedding will be held at Binghai Hotel at 10:00 in the morning.I sincerely hope you can join us.Looking forward to meeting with you.Yours'Ling粗略的修改了下，你的问题在于介词的使用，老外文化的理解和认识。当然，我的修改也不一定都恰当。
Dear Mary, How is everythng going? I'd love tell you something about me . I'll marry to David on 12th ,July.We decide to hold a party in Binhai Hotel at ten clock that day . Wish
Dear Mary,How've you been? Let me tell you something about myself. I will marry Davy on July 12th and at 10 o'clock we will have a small party in the Binghai Hotel. Hope you'
