70. complain of/about抱怨
71. be made up of由…组成be composed of consist of
72. concentrate on集中注意力于be engaged in
73. as far as…be concerned就…而言
As far as wages are concerned,I'm very dissatisfied with the present job.
Concerning=about关于
74. contribute捐献contribute to有助于
Computers will contribute many conveniences to our work.
75. control out of control失去控制under ~在控制之下
76. convenient方便，便利的
77. convince使相信/信服convince…of…
I'm convinced(=I believe)that where there is a will,there is a way.
He was not convinced of his wife's guilty.
78. cope with deal with handle处理，应付
79. at the cost of以…为代价He saved the drown child at the cost of his own life.
at the risk of冒着…危险…
cost spend
The overcoat cost him $200.
He spent $200 on(in buying)the overcoat.
