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15. I will work as hard as I can _____ for the final exam.

A. prepare       B. to prepare     C. preparing    D. prepared

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14. _____ there are many different interpretations of our body language, some gestures seem to be universal.

A. When        B. While       C. Because     D. Since

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13. The speaker raised his voice but still couldn’t make himself _____.

A. hear        B. to hear       C. heard      D. to be heard

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12. Theme parks try to make sure that visitors leave _____ more about their theme.

A. to know      B. knowing      C. know       D. known

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