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20. This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.

A. would          B. should           C. could          D. might

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19. The teacher asked us to write a ________ article.

A. 700 word      B. 700-words     C. 700’s words     D. 700-word

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18. I used to be a very delighted girl. I guess no human being could have passed _______ childhood.

    A. a happy         B. a happier        C. the happier       D. the happiest

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17. The new outline will throw light _______ students’ understanding of history.

    A. upon           B. at           C. of           D. over

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