What does substitution mean to the business world?啥意思怎样回答这个问题 商业替代物是什么啊

What does she like? what does Bob do? What does your mother What time does school what does she do? What does tom do? what does friday do What does she do? what does chinese mean What does it mean What does she work? What does sam what does she doing? What does Miss Green what does this mean? what does the sign What does he enjoy? What does he have?