I like traveling. I have traveled to many places 61 I went to college, and my travel to Tibet impressed me 62 (deep). I took the train there with my friends and enjoyed the scenery all the way. When the train 63 (be) close to Tibet, I had a headache. Then I found 64 difficult to breathe and felt exhausted. I knew that all my 65 (symptom 症状) were called altitude（海拔）sickness. And it took me a few hours to get used to it.
Tibet, 66 (know) as the “Roof of the World”, has 67 great many world-famous places of interest 68 (include) the model of Tibetan architecture, Potala Palace and Mount Everest. So when I felt a little 69 (well), I couldn’t wait to head towards them. I was surprised to find that the top of Mount Everest 70 (cover) with snow even in July and when the sun came out, it became pure and beautiful.