题目内容：

短文改错

I happen to meet some American tourists at the gate of the Summer Palace last week.I greeted them with English and then we began to chat.I got to know that they were college student traveling in China.Most of us were fond of Chinese medicine.They were busy taking pictures and were surprising at the changes had taken place in the past few years.After that,we went boat and had a good time.We were exchanged our e-mail addresses so that we could write to each other in the future.They thanked me again and again.I was gladly to have a chance to practice my oral English.What wonderful experience!