At the door he turned back, a look of inquiry on his face.

George looked at him with an air of inquiry, but said nothing.

We can, to my mind, have good hope of both in the present inquiry.

The result of the inquiry is expected within the month.

Years later I heard there was some kind of inquiry.

At least this boy had a look of inquiry about him.

A sort of inquiry, you might say, on what to do after.

But hasn't the time come for exactly this kind of inquiry?

The question today is what kind of inquiry will this be?

This turned out to be the wrong line of inquiry.