I'm Kate, and my sister____(be) Gina. I'm tidy, but Gina____(be not). In our room, my books and tapes____(be) in the bookcase. My ____(key) are in my schoolbag. I ____ (have) a clock. It's on the desk. ____(Gina) books are everywhere ----on____(she) bed, on the sofa and under the chair. The white model plane is____(she). It's under the desk. “Where are my keys? Where're my ____(ruler)? Where's my schoolbag?” Gina always ____(ask).

正义与民主是当今社会人们津津乐道的社会话题，在古代西方先哲中，首先完整而系统地探究这一问题的是