这块牛排太硬了，我几乎咬不动。

This steak is too ___hard to chew easily.

这个夏天的酷热实在让人难以忍受。

The summer heat this year is so ___harsh that it's hard to bear.

这位老师以对不完成作业的学生严格著称。

The teacher is known for being ___strict with students who don't complete their homework.