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Environmental pollution is one of the most serious problems that confront not only Korea but the world           large.
(A) in
(B) for
(C) at
(D) with
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         on water depends on the density of both the object and the water.
(A) An object floats
(B) Whether an object floats
(C) Does an object float
(D) So an object floats
(E) As an object floats
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In his will, Alfred Nobel left specific instructions           the winners of the science awards he endowed are to be selected.
(A) how
(B) concerning
(C) as to how
(D) about

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