41.   The originals of such paintings were done on buckskin, they say.

42.   The round dome calls for a round loaf and the final rise is done right on the clay plate.

43.   There have been a lot of interesting studies done on identical twins separated at birth.

44.   There would be nothing to do on a Saturday night except to go to the Golden Shell.

45.   They were working flat out to get the job done on time.

46.   This can be done on an annual basis with a bar graph which reveals the annual growth rate.

47.   This was often done on a temporary basis at first, but usually the fences became permanent hedges or walls.

48.   To ensure that different days of the week are covered, the measurements will be done on every twentieth working day.

49.   What did you do on your summer vacation?