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Only by working hard _______ your goal

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions          

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.

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions          

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.