防空系统击落了一架侵入领空的敌机。

The air defense system ___shot down an enemy aircraft that intruded into the airspace.

我提出了周末野餐的建议，但妈妈马上否决了。

I suggested a weekend picnic, but mom quickly ___shot it down.

战斗机飞行员成功击落了敌方的轰炸机。

The fighter pilot successfully ___shot down the enemy bomber.