11.   Keyes refused to speculate on either the provocations or the order of the deaths.

12.   Love would not speculate on why the numbers have Decreased.

13.   On page seventy, Lal had begun to speculate on organisms possibly capable of adapting themselves in ex-posed lunar conditions.

14.   Police would not speculate on a motive, except to say that Avanesian had a long-running dispute with his wife.

15.   The second question is easier to speculate on than the first.

16.   We can only speculate on whether this is another example of the pervasive influence of psychoanalytic thinking in our culture.

17.   We in the news biz often speculate on the potency of your influence.

18.   There could be many reasons and he was not going to waste time speculating on them.

19.   We have too many earthbound worries to speculate on the number of angels who can dance on the head of a pin.

20.   Each member is encouraged to speculate on alternative methods of performing the functions at lower cost.