1. Stephen Foster was one of American's most popular and 'productive' songwriters, composing more than two hundred songs in his lifetime.

prolific

gifted

industrious

diligent

2. He has a natural 'aversion' toward duplicity.

affinity

attraction

distaste

tendency

3. GRAVITY--

irrelevant

strange

seriousness

regular

4. The synonym for 'obdurate'---

deceitful

stubborn

sly

accurate

5. CORROBORATE--

Protect

Urge

Deny

Isolate

6. The opposite of 'Diversity' is--

similarity

originality

longenity

texture

7. Debilitate--

Weaken

Attack

Surmount

Destroy

8. Debilitate--

Weaken

Attack

Surmount

Destroy

9. The opposite of 'hamper' is--

obstruct

interfere

prohibit

facilitate

10. TRANQUIL:

Impatient

Agitated

Vociferous

Noisy