现在，我国共有____个省级行政单位；我们的家乡位于____省．
Housing prices ________ since the end of the last year. Therefore, it's time the central government ________ some effective measures to bring them under control.
秦朝末年，民间流传着“阿房，阿房，亡始皇”的童谣。你认为导致秦朝灭亡的主要原因是（ ）
