The second question: What are the substitutes in life, at least three?

Buses and private cars, washing powder and soap, Coca-Cola and Pepsi.

1, the replacement reason is that buses and private cars are all means of transportation, washing powder and soap can wash clothes, Coca-Cola and Pepsi are both drinkable carbonated drinks, and the items that can be replaced by each other are all items with the same function.

2. Other life substitutes in the second question are: ice cream and frozen yogurt, steamed bread and flower rolls, T-shirts and long-sleeved shirts, gas and electricity, oil and coal.