1.   What a relief it was when the boulders suddenly disappeared, giving way to a stretch of plain where the only obstacles were clumps of bushes.

2.   Anti-nuke groups may not be the only obstacle facing the industry.

3.   Before, the only obstacles were the NCAA sanctions.

4.   But Democrats in the Senate and the White House are not the only obstacle the Republicans face.

5.   But he suggested that the only obstacle to voting to override would be mathematics.

6.   But old laws are clearly not the only obstacle, as Guest, the American ambassador, discovered upon his arrival last month.

7.   But that is not the only obstacle for the new Prudential fund.

8.   But the chicken preferences of Indians are not the only obstacle to frozen chicken.

9.   But the weapons held by violent extremists are not the only obstacle.

10.   China also reached a final accord with Mexico this week, which was the only other remaining obstacle to joining the trade body.