1. three types of columns used in ancient Greek architecture

2. two violins, one viola, and one cello

3. painting

4. Robert Fulton

5. Canada, the United States, and Mexico

6. Istanbul

7. World War One

8. perjury

9. poetry

10. x = 4

11. HIV

12. Egypt

13. Ruth and Esther

14. the human brain!

15. 186,000 miles per second

16. Disk Operating System

17. The tense is future tense, and the voice is passive.

18. The subject -- "Richard and John" -- is plural; however, the verb -- "is going" -- is singular. Thus the error is known as a subject-verb agreement error.

19. horse racing

20. oxen

21. John Nash

22. Belmania is the made-up name.

23. Robert Frost

24. movie director

25. Humphrey Bogart and Ingrid Bergman