21.  It is entirely possible that our backwater of a planet is literally the only one that has ever borne life.

22.  Married men are the only ones in the population who in general tend to reach the high echelons of earners.

23.  Newbill got off easy, but he was about the only one.

24.  Nor is she the only one who feels cheated by Death Row.

25.  Of all the servants, the only one who really understood my need to do things for myself was Koju.

26.  Of these six hormones, insulin is the only one that Decreases the blood glucose level.

27.  Peter was the only one to whom she showed her true self.