I 语法填空（共10小题；每小题1.5分，满分15分）
阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。将答案填写在答题纸的相应位置
It was raining lightly when I__1__(arrive) in Yangshuo just before dawn. But I didn’t care. A few hours__2__, I’d been at home in Hong Kong, with __3_(it) choking smog. Here, the air was clean and fresh, even with the rain.
