第一次听到我的老师骂人时，我真的很震惊。

It was a real shock, the first time I heard my teacher ___swear.

当出租车司机开始对他破口大骂时，他走开了。

When the taxi driver started to ___swear at him, he walked off.

电话一直响，气得我接起来就开始骂。

The phone kept ringing, so I answered it and started ___swearing.