他紧张的表情泄露了他内心的恐惧。

His nervous expression ___betrays the fear inside him.

她背叛了团队，把我们的计划告诉了竞争对手。

She ___betrayed the team by revealing our plans to the competitors.

她颤抖的声音无意中暴露了她的恐惧。

Her trembling voice ___betrays her fear.