Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 4)

People ought to be aware ………………….. the damage they are causing to the environment.

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People ought to be aware ………………….. the damage they are causing to the environment.

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Giải thích

People ought to be aware of the damage they are causing to the environment.