82. We can say a lot of things about those (毕生致力于诗歌的人): they are passionate, impulsive and unique.
83. Mary couldn’t have received my letter, (否则她上周就该回信了).
84. Nancy is supposed to (做完化学实验) at least two weeks ago.
85. Never once (老两口相互争吵)since they were married 40 years ago.
86. (一个国家未来的繁荣在很大程度上有赖于) the quality of education.
82 w ho are devoted to poems in their whole lives
83 or she should have made a reply last week.
84 have finished her chemistry experiment
85 has the old couple quarreled with each other
86 The prosperity of a nation depends largely on