没有人怀疑他的真诚。

There was no doubting his ___sincerity.

他的真诚在他的诗中闪耀，至今仍感动着我们。

His ___sincerity shines through from his poems and it still moves us.

我欣赏她道歉的真诚。

I appreciate the ___sincerity of her apology.