foil|foiled|foiling

她活泼的性格是她内向妹妹的绝佳衬托。

Her lively personality is a perfect ___foil to her shy sister.

警方挫败了恐怖分子的袭击计划。

The police ___foiled the terrorists' attack plan.

他在大学时开始练习水翼运动。

He started practicing ___foiling when he was in college.