Dear Tom.
I arrived here a week ago. AndI visted The White House, Harvard Universty;, The Statue of Liberty, and The Golden Gate Bridge. Amenica is a country with great charm, I have to tell you. But some thing unpleasant happened to  me when I was here. Last week, when we wanted to buy a ticket to Las Vegas, the ticket- sler asked for more 5 dollars for our color. I was inritated and felt exremely unhappy. Besides, I felt unwelcomed when the waiters in the restaurant were impatient towards us. But most time in America, I felt great pleasure and I am gladI had been here.

Yours,
Li Hua .

本文首先讲述了在该地度过了愉快的假期，但美中不足，发生了两件 令人不悦的事情，讲述完这两件事后，总结道虽然发生了这样的事， 但旅途还是令人愉快。注意时态要用一般过去时。