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15. No one but her parents ______ it.

  A. know             B. knows           C. is knowing        D. are knowing

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14. The Olympic Games _______ held every _______ years.

  A. is…four        B. are…four         C. is…five         D. are…five

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13. Apples of this kind _______.

  A. tastes good      B. tastes well        C. taste good        D. taste well

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12. The rich ______ not always happy.

  A. are            B. is               C. has             D. have

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11. Ten dollars ______a big sum for a small child , and they will go a long way .

  A. are            B. being            C. have            D. is

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10. I, who ______ your teacher, will try my best to help you with your lessons.

  A. be            B. am              C. are              D. is

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9. Mary as well as her sisters ______ Chinese in China.

  A. are studying     B. have studied       C. studies              D. study

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8. A large number of students of this school _______ fond of playing football.

  A. are            B. was             C. is               D. be

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7. The air in big cities ______ very dirty by factories.

  A. are often made    B. is often made      C. have often made    D. has often made

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6. The United States of America ______ one of the most developed countries in the world.

  A. is             B. are              C. was             D. were

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