这部电影改编是否忠实于原著？

Was the film adaptation ___faithful to the original book?

在他所有的艺术创作中，他都忠于自己的核心原则。

In all his artistic endeavors, he remained ___faithful to his core principles.

这部纪录片对历史事件进行了忠实的记录。

The documentary provides a ___faithful account of the historical events.