"They had better be ready to answer truthfully any question I ask."

I was able to answer no truthfully, for he had not to us.

But I'm going to ask you again, and you'd better answer truthfully.

And answer truthfully, because in the end there's no other way.

Now that it's out of the way, you may answer truthfully.

This was one question which Harry could not hope to answer truthfully.

"Will you believe me if I promise to answer truthfully?"

I've done my best to answer truthfully, but they asked me a great deal that I don't really know about.

I felt a bit uncomfortable with the question, but answered truthfully.

Questions must be answered truthfully, and instructions followed if possible.