短文改错（共10小题；每小题1分，满分10分）
下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏词符号（∧），并在其下面写上该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意： 1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者(从11处起) 不计分。
Although it was autumn, but it was snowing in Tibet. It was such cold that our legs felt like blocks of ice. On the late afternoon, we found that our water bottles froze because cold weather. But we still enjoyed us during the journey. At one point, we were surprising to find ourselves cycling through clouds. In the valleys colorful butterflies fly around us. It was a great fun to cycle down the hills as it gradual became much warmer. So we had to change our warm coats for T–shirt and shorts.