那架小型飞机突然失去高度，朝着森林猛冲下去。

The small plane suddenly lost altitude and ___plunged ___down towards the forest.

她毫不犹豫地跳入了冰冷的湖水中。

Without hesitation, she ___plunged ___into the icy cold water of the lake.

令人失望的财报发布后，该公司的股价暴跌。

The company's stock price ___plunged after the disappointing earnings report was released.