We are busy preparing for/with the exam.
49. call at (a place)拜访某地
I called at the tailor's a couple of days ago.
50. call back回电话
I will call back later.
51. call for到某地取东西;接人;要求;呼吁
A man calls every Monday for old newspapers.
I'll call for you at 6 o'clock.
The occasion calls for prompt action.
People all over the world call for peace.
52. call in请(医生)
Please call in a doctor at once.
53. call on拜访某人
My uncle called on me yesterday on his way home.
54. take care of照顾;负责
The nurse took good care of the patients.
Here, let me take care of the cleaning.
These are the devices that take care of the waste from the factory.
55. care for 担心、关心、想
My parents care for my safety when I travel by myself.
The elders should care for the younger generation.
Would you care for a game of table tennis?
56. carry off夺走(生命);取得(奖励等)
The terrible war carried off her father's life.
Tom carried off all the school prizes.
57. carry on进行
The discussion carried on after a short break.
58. carry out实施
The plan has to be carried out as soon as possible.
59. catch fire起火
This material is easy to catch fire. Be careful.
60. catch up with赶上
I have to study even harder than before in order to catch up with my peers.
The shirt is too big. Can I change for another one.
He changed into his working clothes when he began to work.
63. change one's mind改变主意
I persuaded him to change his mind.
64. check out核对，检查
Would you help me to check out the names and numbers.
He checked out and left the hotel.
65. clear away收拾，整理
Please help me to clear away the tea things.
66. clear up(指天)晴朗;清理
The weather/sky is clearing up.
Clear up the desk before you leave the office.
67. catch/take cold; have a cold感冒
He was absent because he caught cold last night.
68. come about产生……结果
How does it come about half of the class are absent?
69. come across碰巧遇到;突然想起
I came across this old brooch in a curio shop.
The thought came across my mind that we …
70. come back回想起来
Their names are all coming back to me now.
71. come down(指雨)下得很大;(指气温)下降
The rain came down in bucketfuls.
The temperature came down suddenly.
72. come from来自
Much of the butter in England comes from New Zealand.
73. come off脱落
The button has come off my coat.
74. come on加油
Come on! Let's race to the bottom of the hill.