Bộ 3 Đề thi giữa kì 1 Tiếng anh 12 có đáp án - Đề 1

If we have leant something from our (5)______, we should keep these new sources of water clean.

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If we have leant something from our (5)______, we should keep these new sources of water clean.

efforts

lessons

attempts

mistakes

Giải thích

Chọn đáp án D.