我真后悔说了那句话。

I could have ___kicked ___myself for saying that.

然而，让我一直懊悔的是，这次我的伙伴也处于危险之中。

Nevertheless, what kept me ___kicking ___myself was that this time my partner was in danger as well.

错过了截止日期后，他因没有早点开始而懊悔不已。

After missing the deadline, he was ___kicking ___himself for not starting earlier.