| 1 | The son then gives a knowing smile. | |
| 2 | The hall was resounded with knowing laughter. | |
| 3 | He laughed the same hearty laugh of almost fifteen years before. | |
| 4 | Every actor has cold feet just before the beginning of a show. | |
| 5 | We smiled sentimentally like women will do because conversations like that touch our hearts. |