C 1. [C] how

B 2. [B] In particular

D 3. [D] necessary

C 4. [C] optimism

D 5. [D] change

B 6. [B] measured

A 7. [A] Sure

D 8. [D] headquartered

A 9. [A] explain

B 10. [B] factors

A 11. [A] desirable

C 12. [C]emerged

A 13. [A] attribute

D 14. [D]experienced

A 15. [A] thus

D 16. [D] equally

C 17. [C] While

C 18. [C] hints

A 19. [A] shape

B 20. [B] lean towards