15. A. rich 16. A. lovely 17. A. So 18. A. does 19. A. what

20. A. interests

B. clever C. interested B. valuable C. simple B. Then C. Just then B. does not C. will

B. in which

C. which

B. experiences

C. mind

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D. easy D. tiresome D. Maybe D. can often D. when D. skill