71.   It took a mighty effort to get everything done on time.

72.   The planning, however, is done on the Gantt chart with the critical path clearly shown by colour or shading.

73.   One night he trotted across the hearth and proceeded to do on the video recorder what trained dogs do outside -- usually on trees!

74.   Since they would do this on foot, many vehicle journeys would be saved.

75.   The image that appears on the paper is a mirror-image of the original drawing done on the stone.

76.   This means that work has been done on the system.

77.   Genetic screening during pregnancy may be done on fluid or tissue samples surrounding the foetus which are obtained using amniocentesis or the newer chorion villi sampling procedure.

78.   After all, it has already been done on animals like mice and sheep.

79.   Sometimes I get confused between work and socialising, especially when we spend our off-duty time discussing what we did on duty.

80.   They had to help their neighbors if ordered to do so by their chiefs, but they were obliged to do nothing on their own initiative.