我本想告诉她奈杰尔打过电话，但我完全忘了。

I meant to tell her Nigel had phoned, but it completely ___slipped ___my ___mind.

我本来有件事要说，但在提到之前就忘了。

There was something I needed to say, but it ___slipped ___my ___mind before I could mention it.

我全神贯注于那份报告，完全忘了团队会议。

I was so preoccupied with the report that the team meeting completely ___slipped ___my ___mind.