习题：

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

　　答案：
　　1:  No sooner did I get home  than the telephone rang.
　　2:The old man regretted being nowhere  in his life.
　　3:He is more than fifty years old , but he looks younger than his age.
　　4:Many big cities in the world are facing the problem of lack of water resource .
　　5:He said nothing, leaving me having no idea about his plan .