他们总是拿我开玩笑来取乐。
They always make jokes ___at ___my ___expense for entertainment.
因为他超重,同事们经常开他的玩笑。
Because he was overweight, his colleagues often made jokes ___at ___his ___expense.
在会议上,他开了新员工的玩笑,让大家都笑了。
During the meeting, he made a joke ___at the new employee's ___expense, making everyone laugh.