31.   Tom Rooney was standing by the door with his pocket-watch in his hand, allowing his men out in regular intervals.

32.   Trees had been planted at regular intervals.

33.   Unfortunately many clinicians use this approach in an incorrect manner and do not follow up at regular intervals.

34.   We all overfly the border at regular intervals.

35.   You do not need to dip into this money at regular intervals, but wish to retain it for the future.

36.   Make a point of backing up your files at regular intervals.

37.   Check the oil at regular intervals, and have the car serviced regularly.

38.   The cartridge must be replaced at regular intervals.

39.   George struggled wildly, going under and resurfacing at regular intervals.

40.   The interest is compounded at regular intervals.