83. You are crazy to do such things. 发疯的；不切实际的　

be crazy about/on sth　　 着迷…　　　 He is crazy about dancing.

82.crawl爬，匍匐前进　 　a snake crawling along the ground

　　　　　　　　　　 A baby crawls before it can walk.

81. The course of our life is from our birth to our death. …过程…　

complete my college course　　 课程　　　　 in / during the course of 在…期间　

80. have the courage to do　　 有勇气去干…　　　 lose courage　

79. at a low cost　 成本　 it cost sb time/money to do... 花费　　 sth cost sb money　 值　 　

The accident cost him his life. 使…为代价

78. in the corner of ,　 at/on the corner of ,　 around the corner　　 The shop is around the corner.　 Christmas is around the corner .圣诞将近。(=at hand = near)　　　 be in a tight corner

drive sb into a corner = corner sb 使…处于困境

77. tell lies 说谎　　　 talk nonsense 胡说　　　　 talk business　 说正紧事

76. at one's convenience　　 在…方便时　

It is convenient to sb...　 It is convenient for sth...　　 It is convenient for sb to do...

75. be in control　 = be under control　 在…控制下　 be out of control = beyond control　

be in control of　 掌管　　 have control over / of 管的住　 have no control over / of 管不住

74. contribute $10 to a charity collection　 捐赠　

contribute to sth　 促成，有助于　 Does smoking contribute to lung cancer?

Doing exercise contributes to our health.

the contribution of money捐赠