中国已经成功地举办了2008年奥运会。
China has already _______ in _______ the 2008 Olympic Games.我们应该执行独生子女政策来控制人口。
We should _______ _______ the one-child policy to control the population.每年成百上千万的游客到中国来参观长城。
Every year ______ ______ visitors come to visit the Great Wall.自从我来到了马坪中心中学我就买了这辆自行车了。
We_______ _______ the bike since I came to MaPing Center Middle School.因为空气污染，我都呼吸困难了。
It’s _______ for me to _______ because of the air pollution.