11. My parents will have celebrated 30 years of _______ by next week.   a. marry           b. married          c. marriageable       d. marriage   12. London is home to people of many _______ cultures.   a. diverse          b. diversity         c. diversify          d. diversification   13. Some people are concerned with physical ______ when choosing a wife or husband.   a. attractive        b. attraction        c.attractiveness      d.attractively   14. Mrs. Pike was so angry that she made a _______ gesture at the driver.   a. rude            b. rudeness         c. rudely            d. rudest     15. She sent me a _______ letter thanking me for my invitation.   a. polite           b. politely          c. politeness         d. impoliteness   16. He is unhappy because of his --------------.   a. deaf            b. deafen          c. deafness          d. Deafened   17. His country has -------------- climate.   a. continent         b. continental        c. continence        d. Continentally   18. She has a -------------- for pink.   a. prefer            b. preferential        c. preferentially       d. Preference   19. Computers are -------------- used in schools and universities.   a. widely           b. wide             c. widen            d. Width