11.   The forecasters of the past always presumed that once automobile travel became universal, horses would become extinct.

12.   The horse became a bit unruly in the starting gate.

13.   The horses became shaggy-maned mustangs.

14.   The horse has become such a pet of the local fans that his latest race was named for him.

15.   The money for the breeding program was lost because the horses became unruly, and the Forest Service sterilized them.

16.   The soldiers protected their homeland, and before long the horse became an object of great affection in Chinese culture.

17.   The special horse now has become the star of the sport and the center of its greatest controversy.

18.   When the kingdoms of Europe declined, the horses almost became extinct.

19.   When a pack horse became lost, Neelly stayed behind.

20.   Police horses have become part of the urban landscape in many major U.S. cities.