1.   At another table, people were speculating about her.

2.   Conspiracy buffs are having a field day speculating about White House motives.

3.   Could it be that one far-off day intelligent computers will speculate about their own lost origins?

4.   Goldin has previously speculated about the possibility of interstellar flight using extremely small, low-mass probes.

5.   I can only speculate about the reasons for their success.

6.   It is legitimate to speculate about the Devil as long as we do not assume that our speculations have the solidity of holy writ.

7.   It is not altogether idle to speculate about what seems to be driving the private ambivalence and the public controversy.

8.   Left alone, we began to speculate about where we were and why, and where we would ultimately be taken.

9.   Mrs Saulitis, in spite of her love for the sergeant, had speculated about romantic possibilities with Captain Vilcins.

10.   Nellis and Weir Declined to speculate about military applications.