Manufactures know that wastes from factories make water and soil polluted, but they do not want to spend a lot of their money on (5) _______ the wastes safely
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the question.
Manufactures know that wastes from factories make water and soil polluted, but they do not want to spend a lot of their money on (5) _______ the wastes safely