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Many places of (A) history, scientific, (B) cultural, or scenic importance (C) have been designated (D) national monuments.

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Only by working hard _______ your goal

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Some (A) of the agricultural practices (B) used today (C) is responsible for (D) fostering desertification.

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Doctors advise _______ too many hours working on the computer. It ‘s very bad for your eyes.

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must be treated.(A) Some underground water is (B) enough safe to drink, (C) but all the surface water (D) must be treated.

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Many lists of “Wonders of the World” _______ during the Middle Ages

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Ann: “ Shall we eat out tonight?”                             David: “-_______”

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Thomas Edison _______ many new appliances using electricity during his long career.