她对那个投资机会持怀疑态度，没有轻易相信对方的承诺。

She was ___skeptical about the investment opportunity and didn't easily believe their promises.

他对这个新理论持怀疑态度，因为它违背了传统观点。

He was ___skeptical about the new theory as it contradicted conventional wisdom.

她对那个陌生人的承诺表示怀疑。

She was ___skeptical about the stranger's promises.