They'll have a beer together______,talking about their separate life, but not often.

A．by and by

B．now and then

C．all the time

D．more or less

一节公开课，教师要求学生用“宫”字组词。很多同学组词为：“宫殿”“皇宫”“故宫”，突然有一个同学大声说“子宫”。这个时候同学们的眼睛都盯着老师，有的同学已经快要笑出来了。

此时，作为教师，你该怎么处理？