我已经记不清她这个月迟到多少次了。

I've ___lost ___count of how many times she's been late this month.

在讲座中，我记不清教授用了多少个专业术语。

During the lecture, I ___lost ___count of all the technical terms the professor used.

他一定是在加总数字时记错了数，因为他的总数完全不对。

He must have ___lost ___count while adding up the figures, because his total is completely wrong.