Her mouth gaped for a moment before any sound came out.

She gripped the arms of the chair, and her mouth gaped.

His arm is over the back of a chair, mouth gaped open, possibly lost in thought.

Where they met, the great mouth of bare stone gaped open.

Its ugly mouth gaped wide enough to hold a human body.

Now his mouth gaped open, but still he made no sound.

His mouth gaped, and he pointed high into the western sky.

His mouth gaped open, and for a second he froze.

His mouth gaped as he tried and failed to draw air.

That mouth gaped wide enough to bite me in half.