在许多地方，见面时握手是一种习俗。

In many places, it is a ___custom to shake hands when meeting someone.

当地的习俗可能因城镇不同而有很大差异。

Local ___customs can vary greatly from one town to another.

吹灭生日蛋糕上的蜡烛是一种习俗。

It is a ___custom to blow out candles on a birthday cake.