9＋4=____
已知等腰三角形的两条边长分别是7和3，则第三条边长的是( )
It's illegal to read people's private letters without ____(许可)
在80克水中放入20克糖，糖占糖水的百分之几？正确列式是（ ）
Their first ____ had a white ____ on it. This is a symbol of good____.
