21.   Politicians can exploit a laborious sequence of reiterated doubts to postpone action even in those areas of which they are quite certain.

22.   Prominent individuals were often prominent by virtue of the groups of which they were leaders.

23.   She published a total of sixteen books in her career, of which ten were Gothic Novels.

24.   Since then, the ideas of which Dawkins was an early champion have changed biology beyond recognition.

25.   Some were imposed by monasteries on benefices of which they were the patrons, sometimes as a half way stage to appropriation.

26.   The bull in question had Markings of which he was particularly proud.

27.   The worry which most perturbed Winnie was one of which she was deeply ashamed.

28.   They controlled the flow of whatever it was the people needed or thought they needed or were persuaded they needed.

29.   When she went shopping to the town she wore a long, voluminous, dark-grey cloak of which she was very proud.

30.   Your article made it to a Woodson descendants list on the Internet of which I am a recipient.