我把卡忘在家里了，现在只能用现金付款。

I left my ___card at home, so I have to pay with cash now.

警方认为这起案件是一名模仿原凶手作案手法的模仿杀手所为。

The police believe this case was committed by a ___copycat copying the original killer's signature.

系统工程师使用cck来增强不同模块之间的兼容性。

The system engineer used ___CCK to improve compatibility between different modules.