因为牛奶用完了，我用了豆浆作为替代品。

Since we ran out of milk, I used soy milk as a ___substitute.

椰子糖可以作为白砂糖的健康替代品。

Coconut sugar can be a healthy ___substitute for white sugar.

教练决定用年轻球员替补受伤的主力。

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