21.   The big unknown is how important the issue is to voters.

22.   The big unknown is whether governments are prepared to do anything about it.

23.   The big unknown is whether Mashburn can stay healthy.

24.   The big unknown, however, remains the impact of global markets on local communities like Texarkana, Tex.

25.   The effect of separation on trade also is a big unknown.

26.   The effect a televised execution would have on viewers is a big unknown in the equation.

27.   The really big unknown is how much is being bet on the basketball tournament and other sporting events on the Internet.

28.   There is, however, one big unknown.

29.   What help he can provide is a big unknown.

30.   But whether such a measure would create a space for peace or spark new violence was the big unknown.