praise them in public.在私底下要忠告你的朋友，在公开场合又表扬你的朋友。
　　
　　A disease known is half cured.病情确诊断，治病好一半。
　　
　　A discontented man knows not where to sit easy.不满足者坐无宁时。
　　
　　Actions speak louder than words.事实胜於雄辩。
　　
　　Action is the proper fruit of knowledge.行动是知识的巧果。
　　
　　A creaking door hangs long on its hinges.户枢不蠹。
　　
　　A crafty knave needs no broker.狡猾的流氓，不需居间人。
　　
　　A covetous man is good to none but worse to himself.贪婪的人对别人毫无好处，对自己却坏处更大。
　　
　　A contented mind is perpetual feast.知足常乐。
　　
　　A constant guest is never welcome.久住非佳宾，常来不欢迎。
　　
　　A common danger causes common action.同仇敌忾。
　　
　　A cock is valiant on his own dunghill.夜郎自大。
　　
　　A close mouth catches no flies.病从口入，祸从口出。
　　
　　A clear fast is better than a dirty breakfast.宁为清贫，不为浊富。
　　
　　A clear conscience laughs at false accusations.白日不做亏心事，夜半敲门心不惊。
　　
　　A clear conscience is a sure card.光明磊落，胜券在握。
　　
　　A clear conscience is a soft pillow.问