The word “it” in paragraph refers to

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  The higher the cost of living is, .

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  Harmful environmental factors can the development of certain diseases.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  The dog my father gave me is very lovely.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  The success of the company in such a market is remarkable.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  There has been growing public concern about the use of chemicals in food recently.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  A lot of research in medical science has been to improve human health.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  Last week, we an interesting film about the animal world.

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  Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

  Peter bought a car as a present for his wife two weeks ago.

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