他在晚宴上误将老板的妻子认成了女儿，这可真是个社交失误。

Mistaking the boss's wife for his daughter at the dinner party was a serious ___gaffe.

他在晚宴上叫错了客人的名字，犯了社交失礼。

He made a social ___gaffe by calling the guest by the wrong name at the dinner party.