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6: _________________________( 我刚刚到家 ) than the telephone rang.
7:The old man regretted __________________________( 一事无成 ) in his life.
8:____________________( 他五十多岁 ), but he looks younger than his age.
9:Many big cities in the world ________________________( 正面临淡水资源短缺 ).
10:He said nothing, leaving me _____________________ ( 对他的计划毫不知情
