_ air is one of the many problems we have to solve
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Choose the word or the phrase or sentence that best completes each unfinished sentence below or that best keeps the meaning of the original sentence if it is substituted for the underlined word or phrase.
_________ air is one of the many problems we have to solve.
Pure
Polluted
Dust
Pleasan
Giải thích
Đáp án: B
Dịch: Không khí ô nhiễm là một trong nhiều vấn đề chúng ta phải giải quyết.