她当时在梯子上清洁窗户。

She was up on a ___ladder, cleaning the window.

我祖父昨天修理坏掉的灯泡时从梯子上摔了下来。

My grandfather fell down from the ___ladder yesterday while he was fixing the broken light bulbs.

消防员迅速爬上梯子去救树上的小猫。

The firefighter quickly climbed the ___ladder to rescue the cat from the tree.