改动以最少为原则; 虚词以添加或删除为原则; 实词以改变词形为原则以保持句子原意为原则。
It's been a week after we left your family and we are now back home. Thank you very much for showing them around your city and providing us for the wonderful meals. After we said goodbye to you, we went to Washington D.C., which we stayed for three days. My brother was so much fond of the museums there that he begged my parents to staying another couple of day. However, my father had to return to work on Monday so we fly back last Saturday afternoon. It was really a nice experience. If you'd like to make trip to our city some day, I will be better than happy to be your guide.
My summer travel started terribly .I was at the Shanghai Railway Station buy a ticket to Hang Zhou. I was going to visit a friend here and after that I would go to Xiamen for long holiday. I bought my ticket but turned around to pick up my bag from the floor and then I realized that someone had stolen it. Luckily I had all my money on my pocket, but the only clothes I had was those I had on. It felt very strange to travel without any luggages. When I finally arrived at my friend, he lent to me lots of clothes. I feel very happy that I could change my clothes at last.