豆腐是素食烹饪中常见的肉类替代品。

Tofu is a popular meat ___substitute in vegetarian cooking.

不要用维生素片来替代均衡的饮食。

Don't use vitamins as a ___substitute for a balanced diet.

受伤的演员由一名替角替代，出演今晚的演出。

The injured actor was replaced by a ___substitute for tonight's show.