11.   The same new acoustic effect has been discovered repeatedly throughout the past century!

12.   This section begins by looking at the changing fate of old people during the past century as they have retired.

13.   Somerville has been enormously enriched over the past century by Somervillians remembering the College in their wills.

14.   For the moment, what concerns us is that this government is the product of change extending over several centuries, coming to fruition only in the past century.

15.   The singular style evolved from church singing in New England in the past century.

16.   Americans never have been very good at being extended families, even in centuries past.

17.   Among presidents of the past century, Clinton is unique.

18.   Americans are embracing the Internet faster than nearly any technology introduced to them in the past century.

19.   Among the well-to-do classes of centuries past, many failed to resist worldly temptation, turning into cruel and callous rulers and indulging in empty, fast living.

20.   An important reason for the vigor of the American economy in the past century has been its tough anti-monopoly policies.