11.   One of the features that distinguishes the United States from other countries is the extent to which teenagers work.

12.   Our first priority is safety, and the airline is working to that end.

13.   Plants work to rules rather different from those of animals.

14.   Silverpoint must be worked on to a specially prepared ground.

15.   Some exhibit elsewhere, work to other commissions or produce high-quality joinery.

16.   Sometimes a lack of experience can work to your advantage.

17.   The agencies are working together to co-ordinate policy on food safety.

18.   The caryatids were sculpted not by Leoni himself but by Antonio Abbondio working to drawings by the owner.

19.   The churned product is salted and worked to the legal moisture content.