80．concentrate(…)on专心于，聚精会神于

P1ease concentrate on the lesson．

79．cool off变凉，冷却，冷静

It cooled off after the downpour last night．

78．cheat…of骗取某人某物

He cheated me(out)of my money．

77．charge…for索价　 ’

charge…with控告

We don’t charge anything for that．

He was charged by the police with breaking the law．

76．centre．．．on集中……于

She centred her attention on the problem．

75．be buried in埋头于

He was buried in a book99．object to反对

Do you object to such simple pleasures?

74．benefit from得益于

I benefited from my father’s advice

73．beg for乞求　

He came over and begged for a light

72．become of发生

　 They wondered what had become of him．

71．be aware of知道，意识到

　 He was not aware of her presence till she spoke to him．