打开窗子透透新鲜空气。应当有礼貌地和老人交谈。乘出租车从我们学校到市中心只需20分钟。地球上的污染正变得越来越来严重。虽然我们尽了最人的努力，但还是输了比赛。
The Chens have moved into a new flat，leaving their old house （having nobody inside）．
We don't （be not sure if something is true）the great achievements China has made in the past 40 years．
How calm and brave the command （飞行员）was to fly the plane back safely in such a dangerous situation！
In Western culture，"Black （星期五）"sometimes represents an unlucky day．
Look， our library is （东）of the classroom building． It looks modern．
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