cavil|cavils

她对晚宴的唯一挑剔是桌布的颜色太暗了。

Her only ___cavil about the dinner party was that the tablecloth was too dark.

他总是对别人的计划吹毛求疵，即使是最小的细节也要挑剔。

He always ___cavils at others' plans, even finding fault with the smallest details.

他总是对别人的建议吹毛求疵，而不是提出建设性的意见。

He always ___cavils at others' suggestions instead of offering constructive feedback.