1.   An old trick but it still works.

2.   An old trick, but they had performed it flawlessly.

3.   I was at my old tricks, the selfish member of a selfish society.

4.   The old trick of keeping a straight face was failing him these days.

5.   This is an old magic trick which entails some preparation.

6.   I have no respect for my father who, having remarried, is still up to his old tricks.

7.   Will he ever teach his new dog the old tricks?

8.   An old trick, really.

9.   And they are up to their old trick of coming up big in big games.