authenticity

他的演讲因其真诚和真实性而打动了观众。

His speech moved the audience because of its sincerity and ___authenticity.

专家们正在检验这幅画作的真实性。

Experts are examining the ___authenticity of this painting.

历史文件的真实性对研究非常重要。

The ___authenticity of historical documents is crucial for research.