11.  The threat closed the airport, leaving a single way into and out of the city, the Mount Igman Road, which is constantly targeted by Serbian guns.

12.  The task force concluded that the single most effective way of reducing truancy would be to enforce existing laws.

13.  The US Environmental Protection Agency argues that a tougher vehicle-inspection system is the single most effective way to reduce summertime smog.

14.  There is no single right way to transfer assets to the next generation.

15.  Adaptation, however, does not involve adopting a uniform model or a single way of thinking.

16.  Government officials and automakers have repeatedly said that wearing seat belts is the single most important way to prevent passengers from being ejected in a rollover crash.