學習單：

Oliver always struggles with vocabulary memorization. He is upset because he was sick during the English test and Peter did better on the test this time. Peter has been acting cocky and telling other people that Oliver is studying the wrong way. Oliver is nervous about the next test and he wants to do better.

When the cat is away, the mice will play.
He looks like the cat that ate the canary.
She let the cat out of the bag.
Oliver looks like a cat on hot bricks.