The professor nodded before I could stop him.

The professor nodded, and Eric did the same.

The professor nodded, then took a deep breath.

The professor nodded his head in approval, urging the students to "assimilate the pain."

The professor nodded and pushed himself up out of his chair.

The professor nodded and smiled her permission at him.

The professor nodded and gave him a searching look.

The restaurant was already half full, and indeed the professor nodded to several people on the way to their table, but no one stared at her.

The gray-haired professor nodded as he looked at the reptile.

Dumbly the professor nodded, then grasped Hero by the shoulders.