问题
选择题
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
D
题目分析：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。