如果你的家着火了，你会先救什么？

If your home was ___on ___fire, what would you save first?

爆炸后，几栋建筑都着火了。

Several buildings were ___on ___fire after the explosion.

汽车发动机着火了，所以我们立即叫了消防员。

The car engine was ___on ___fire, so we called the firefighters immediately.