我在提交论文前做了一些更正。

I made some ___corrections before handing in my essay.

她失望地看到她的论文被返还，上面有大量用红笔写的更正。

She was disappointed to see her essay returned with a mass of ___corrections in red ink.

我的新老师对我们作业的更正更加仔细。

My new teacher is more careful with his ___correction of our homework.