预约成功
check in(在旅馆，机场等)登记，报到
check up(on)检查，核实
check out结账离去，办妥手续离去
check over核对，检查
cheer up(使)高兴起来，振作起来
clean out打扫干净;清除
clear the air消除误会(猜疑)
clear away把…清除掉，收拾
clear off离开，溜掉
clear out清除，把腾空，赶出
clear up清理，解决，(天)放睛
critical of对…挑剔
consist of/in构成/在于
cool down/off凉快起来，使平静
cannot…enough无论怎样…都不够
compare notes交流经验
come to the point扼要地说
competent in胜任的
combine…with…把…与…结合起来
come about发生，产生
come across偶然遇见，碰上
come along出现，发生，进展
come apart破碎，崩溃
come around/round苏醒，复原，顺便来访
come at攻击，冲向，达到，了解
come by得到，访问，看望
come down to可归结为
come on(表示鼓励，催促等)快，走吧，开始
