12. One-third of the office was—were late this morning because the cars were not running.

13. He don't—doesn't understand what I mean.

14. If the quality and the price is—are right, buy.

15. There come—comes a crowd of people.

16. The library with its thousands of books was—were destroyed by fire.

17. There don't—doesn't seem to be much difference between the two.

18. The whole system of filing and indexing is—are wrong.

19. Safety as well as success is—are at stake.

20. The state of public affairs calls—call for quick action.

21. Many a man has—have neglected golden opportunities.