IV. Mark the letter A, B, C or D on your answer sheet to indicate the correct answer that best completes each unfinished sentence; best substitutes the underlined part; or has the same meaning to the sentence given.
I don’t think it is a good idea to burn trash to reduce the amount of garbage we produce to protect ________ environment.
A.the
B.Ø 
C.a   
D.an

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