stay on|stayed on

我在学校多待了一年。

I ___stayed ___on an extra year at school.

他留在大学完成博士学位，而他的朋友们都毕业了。

He ___stayed ___on at university to complete his PhD while his friends graduated.

公司裁员后，她决定留下来做顾问。

After the company downsized, she decided to ___stay ___on as a consultant.