Đề thi giữa kì 2 Tiếng Anh 8 Thí điểm có đáp án (Đề 4)
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Air is causing many environmental problems in our cities today

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Choose the best answer A, B, C or D to complete the following sentences

Air __________ is causing many environmental problems in our cities today.

pollute

pollution

polluting

polluted

Giải thích

Đáp án: B