This amounted to about 10 hours of fierce concentration every day.

And it surrounded by material that she examines with a fierce emotional concentration.

He looked up and surprised a look of fierce concentration on her face.

Perspiring freely, his face is a study in fierce concentration.

He steered her in between the other villagers with fierce concentration.

Israel frowned in fierce concentration, but not for long.

Blade took a deep breath and began the fierce concentration of which he was capable.

They spent the next few seconds chewing with fierce concentration.

He gives the same fierce concentration to the most trivial action.

The looks of fierce concentration on their little faces were quite endearing.