11.   Austria began observing European Union rules on relaxed border controls between EU countries for the first time, making passports unnecessary for some travelers.

12.   But if you are impelled to leave your sentences in shards, at least observe the rule for parallel construction.

13.   But many Americans observe the rule of silence by breaking it.

14.   But the gorillas do not observe the rules.

15.   Certainly, this can be eased if headline writers observe an unwritten rule that the Florida governor be referred to only as Jeb in headlines.

16.   Had China observed this rule, the collision would not have happened.

17.   However, she will have to observe the rule against dogfights.

18.   Some American conservatives argue that government is the problem, not the solution, but they are always asking government to make other people observe the rules they approve.

19.   The fighters will be required to observe the rules of their discipline, meaning the boxers cannot kick.

20.   They were required to observe reasonable rules of polite behavior.