pane|panes

窗户上的一块玻璃碎了。

One ___pane of glass in the window is broken.

这栋建筑的玻璃窗格整齐排列。

The building's glass ___panes are neatly arranged.

清洁窗户时，我不小心打碎了一块玻璃。

While cleaning the window, I accidentally broke a ___pane.