以前我们只有一个尘土飞扬的操场，现在我们有了一个草地。

Before, we only had a dusty playground, but now we have a ___grass field.

绿草地上坐满了人。

The ___grass is full of people sitting on it.

那家伙向老师告发了我们逃课的事。

That guy ___grassed on us to the teacher for skipping class.

他不小心在包里留了一些草。

He accidentally left some ___grass in his bag.