我本该给她回电话的，但我完全忘记了。

I was supposed to call her back, but it completely ___slipped ___my ___mind.

他的名字就在嘴边，但在我能说出来之前却一时想不起来了。

His name was on the tip of my tongue, but it ___slipped ___my ___mind before I could say it.

在其他所有紧急任务之中，我把报告截止日期给忘了。

The deadline for the report ___slipped ___my ___mind amidst all the other urgent tasks.