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14. The largest collection ever found in England was one of about 200,000 silver pennies, _____ over 600 years old.

  A. all of which   B. all of them   C. all of that    D. all of it

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13. Good ads _____ on the radio or TV often use words _____ people attach positive meanings.

  A. broadcasting, for which    B. which are broadcast, for which

  C. broadcasting, for which    D. broadcast, to which

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12. Dr. Franklin failed many times but he finally _____ to find a successful way to solve the problem.

  A. broke off   B. broke up   C. broke through   D. broke down

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