复道行空，____？
①废藩置县，加强中央集权 ②实行“班田收授法” ③允许土地买卖，鼓励发展近代工业 ④提倡“文明化”，实行强制性义务教育
Tigers wait _______ it is dark, then go out to find their food.
中南半岛的大城市主要分布在（ ）
_____ your article carefully, some mistakes can be avoided.
