11.   One can only speculate about how a genuinely independent and effective complaints authority would be received.

12.   Party insiders had speculated about competition between Symington and Woods to lead the delegation.

13.   People have been speculating about interstellar flight for years.

14.   The rates are highest in the industrialized world, for reasons that we can only speculate about.

15.   They further speculate about the reasons for which the soul entered the body and its relationship to the universe.

16.   This is not the place to speculate about possible alternatives.

17.   Usually when you wonder what makes people tick you speculate about such things as their motives, attitudes and feelings.

18.   We laughed about it awhile and speculated about what it would have been like.

19.   It is premature to speculate about the resumption of negotiations.

20.   Despite occasional misgivings, however, he was optimistic enough to speculate about the form which the next Labour Government might take...