我的儿子今年五岁了。

My ___son is five years old this year.

儿子，把门关上好吗？外面风大。

Would you close the door, ___son? It's windy outside.

他是这个家族唯一的儿子，肩负着延续香火的重任。

He is the only ___son in the family, responsible for carrying on the family name.