在句子'她把钥匙放在抽屉里'，'在'是一个表示位置的介词。

In the sentence 'She put the keys in the drawer', 'in' is a ___prep that shows location.

考试前的准备阶段总是最紧张的。

The ___prep period before the exam is always the most stressful.

她的父母决定送她去一所私立预科学校。

Her parents decided to send her to a private ___prep school.

我需要提前准备好明天的午餐。

I need to ___prep tomorrow's lunch in advance.