老师已经批改了我们的数学考试。

The teacher has ___graded our math tests.

这个语言课程按照难度分为几个等级。

The language course is divided into several ___graded levels of difficulty.

工人们把山坡修整得平缓一些以便修建道路。

The workers ___graded the hillside to make it less steep for road construction.