1.   As for what prompted Keenan to bolt, nobody would venture a guess.

2.   Asked why the soldiers had entered his house, Jallad, an engineer not known to be linked to militant groups, ventured a guess.

3.   But few venture a guess at what the number might be.

4.   But Gary Haynes, a paleontological ace and frequent consult from the University of Nevada-Reno, ventured a guess.

5.   But she herself shies away from venturing a guess.

6.   But Richard Williams did not venture a guess as to which daughter would have better control of their power and emotion when match-time arrives.

7.   But several other vehicles were still submerged, and none of the shovelers ventured a guess as to when they might move again.

8.   But the agency declined to venture a guess as to how many refugees there might be.

9.   But then Grahek, who works for a government agency he did not want to specify, ventured a guess.

10.   No one will venture a guess.