At the sound of her voice his head snapped up and the book fell shut.

His head snapped up to a call only he heard.

The older one's head snapped up as she heard him.

Her head snapped up at the sound of breaking glass.

His head snapped up so that he could see me.

They were sitting on the floor resting when suddenly the old man's head snapped up.

Her head snapped up and she gave me an angry look.

Her head snapped up, and she looked at him hopefully.

All at once every head snapped up in my direction.

His head snapped up and he stared into her eyes.