Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 2)
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The authorities have improved the public transport system recently. (improvements) The authorities the public transport system recently.

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The authorities have improved the public transport system recently. (improvements)

The authorities ……………………………………………………………..………the public transport system recently.

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Đáp án:

 The authorities have made (some) improvements in the public transport system recently.

       improve sth – make (some) improvements in sth