It is a common to have a cake with candles to celebrate a holiday birthday or any other

问题补充：

It is a common to have a cake with candles to celebrate a holiday ，birthday or any other occasion.

A. law

B. rule

C. tip

D. custom

答案：

A. law

B. rule

C. tip

(答案→)D. custom

解析：A. law 法律，B. rule规定，C. tip建议，D. custom风俗，句意：用带蜡烛的蛋糕庆祝生日，假期或其他场合是常见的风俗。所以选D。