1.   Jean was unable to resist the impulse to return her smile.

2.   Mark returned her smile.

3.   They grinned at her in an easy, friendly way and she returned their smiles.

4.   He smiled at her warmly and she returned his smile.

5.   Moira Russell returned her smile, and went to another door in the room, where she tapped and went in.

6.   He returned the smile warily.

7.   She returned his smile slowly.

8.   Catalanotto tried to return the smile.

9.   She returned the smile.

10.   She paused and returned his smile.