当牛奶用完时，豆浆可以作为一个很好的替代品。

When milk runs out, soy milk can be a good ___substitute.

我用豆浆代替牛奶做蛋糕。

I use soy milk as a ___substitute for milk in baking cakes.

教练决定用年轻球员替换受伤的主力。

The coach decided to ___substitute the injured starter with a young player.