【正确答案】Dear Li Qiang,
I am writing this letter to express my sincere thanks for your warm hospitality during my visit to Shanghai. Thank you for your invitation to your home. I enjoyed my tour and appreciated your attention and invitation.
During my visit, everything went on very well. And I was very impressed by your lovely home and delicious meals on the Friday night. I am still thinking about it and enjoy it in retrospect.
It will be my privilege and pleasure to return your hospitality sometime in the future when you come to Xi'an. Please accept my sincere thanks and best wishes once again. I am looking forward to seeing you in the near future.