在比赛中，他使用了卑鄙的手段让对手犯规。

During the game, he used a ___dirty trick to make his opponent foul.

他把室友的鞋子藏起来，真是个卑鄙的恶作剧。

Hiding his roommate's shoes was such a ___dirty trick.

他在竞选中使用了卑鄙手段来抹黑对手。

He used ___dirty tricks to smear his opponent during the campaign.