The ___ (difficult) is to stop students from talking.

问题描述:

The ___ (difficult) is to stop students from talking.

The difficulty (difficult) is to stop students from talking.
填名词单数Today we will __ (main) talk about how to learn English well.Today we willmainly (main) talk about how to learn English well.能解释一下为何用mainly吗?因为修饰动词【talk】所以用副词mainly