1.   Because the religion is not centralized and has a history of profound secrecy, it is still difficult to know just how many people practice it.

2.   But his sons are hard-working, media experts said, adding that it was impossible to know just how much Murdoch controlled their activities.

3.   But neither the Board of Elections nor the candidates seem to know just how many corrected ballots there are.

4.   Despite the apparent interest, it is hard to know just how many people follow through with moving a house.

5.   Does your young driver know just how hard you can safely turn a car to avoid danger?

6.   Few policy planners even know just what resources are available.

7.   However, it was too soon to know just how badly the Carolinas would be hit.

8.   In the days and weeks to come, who knows, Spielberg just might come in for criticism.

9.   Investors who want to know just what is going on at the company, which says it has high hopes in telecommunication services, must wait, however.

10.   It is impossible to know just how many people in the county are HIV-positive, because health officials keep records only for patients with full-blown AIDS.