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re as a part of our clean-air programme. The money from our wakl will be used in...

老师（ ）在教室里，（ ）在办公室里。50．这种布（ ）颜色和图案非常美观，（ ）结实耐用。50．妈妈每天准时去上班，（ ）遇上了坏天气，她（ ）不...