苹果从树上笔直地掉了下来。

The apple ___plummeted straight down from the tree.

由于经济危机，房价在三个月内暴跌了25%。

Due to the economic crisis, housing prices ___plummeted by 25% in three months.

温度在夜里骤降了十度。

The temperature ___plummeted by ten degrees overnight.