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短文改错（满分10分）
I went to the Summer Palace last week. At the gate，I happened to meet some American tourist. I greeted them in English but then we began to chat. I got know that they were college students travel in China. Most of them were fond of Chinese medicine. They are busy taking pictures and were much impressed with the changes that had been taken place in the past few years as well . After that, we went boating on a lake and having a good time. We exchanged their email addresses so that we could write to each other in future. They thanked me again and again. I was very gladly to have a chance to practising my oral English.