图书室借出456本书，还剩207本书，现在又还回285本，图书室现在还有____本书。
Yu Qiuyu ______ us a wonderful speech in Guangyuan last month. We all learned a lot from it.
在长为10cm的线段AB上任取一点C．现作一矩形，邻边长分别等于线段AC，CB的长，则该矩形面积不小于9cm2的概率为____
The riv er runs ____ (quick).
— Next month.
