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

These create huge mountains of waste that are extremely hard to get (77) ………………….. of

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These create huge mountains of waste that are extremely hard to get (77) ………………….. of

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These create huge mountains of waste that are extremely hard to get (77) rid of.