11.   In the end each successive British government was obliged to trust the Americans, and to hope that circumstances would not arise when it disagreed with American policy.

12.   But the Americans might hope with some reason that these exceptional circumstances would never arise.

13.   Unforeseen circumstances can arise, such as a car breakdown.

14.   These circumstances will arise in the majority of instances of expert determination.

15.   Based on his experience, Glavine said, if similar circumstances arise he probably would not be so readily accessible for interviews.

16.   However, some circumstances could arise that would make the sum end up being less than what is needed.

17.   No one has shown that the circumstance has ever arisen.

18.   Similar circumstances have arisen only twice before.

19.   The promise holds even if unforeseen circumstances arise, which may demand further steps to preserve species.

20.   This unusual circumstance arises from the economy.