马挣脱开跑走了。

The horse broke ___free and ran away.

如果动物生来自由，为什么它们必须生活在监狱里？

If animals were born ___free, why do they have to live in a prison?

我们打开笼子后，鸟自由地飞走了。

The bird flew ___free after we opened the cage.