truthfulness

I've read this report carefully and I can vouch for its truthfulness.

我已仔细看过这份报告，我可以保证它的真实性。

I fired a hundred questions concerning the truthfulness of his statement.

我对他发言的真实性提出一连串质问。

The reporter raised a question touching the truthfulness of his statements.

记者对他发言的真实性提出疑问。