21.  This school is infinitely better than the last one I went to.

22.  He replaced the boiler when the last one began to spout flames.

23.  This test seemed much less difficult than the last one.

24.  He was the last one out of the building.

25.  No title for the last one.

26.  That was the last one.

27.  The penultimate column shows the estimated cost to completion and the last one the budget for the project.

28.  All my answers had to be in the affirmative with the exception of the last one because, to be precise, Holmes does exactly as he wants.

29.  The big feller had struck up the opening chords of his set, the last one of the evening.

30.  That letter was a card up his sleeve, the last one he had.