51.   What others do on automatic pilot becomes a tiresome, anxious, effortful task.

52.   White, who is doing research on the disease, was able to determine its DNA sequence.

53.   Wise-guy Brooklyn alley cats had bread and dripping for tea, just as I did on Sunday evenings.

54.   You must try harder to get your homework done on time.

55.   We talked, exchanged email addresses and phone numbers, as you do on planes.

56.   How did you do on your maths test?

57.   What are you doing on the weekend?

58.   Some remedial work needs to be done on the foundations.

59.   A load of Michael Schumacher wannabes trying to show what they can do on the track.

60.   We had nothing else to do on those long trips.