【正确答案】Dear Bob,
How's every thing going? I miss you a lot.
The summer vacation is coming. I'm writing to tell you that my parents and I would like to invite you to visit Shanghai and stay with us this summer. I plan to show you all the historical sites and scenic spots here; such as Shanghai Oriental Tower, which is the highest in China, Jin Mao Mansion and the famous Yu Yuan Garden. I am sure you will enjoy this visit.
I am looking forward to hearing from you.