Q: Sam spent most of his time standing up. His job was hectic and he never got any rest. But he was the best cashier at his workplace.  Where might he work?
Options:
- bookstore
- count till
- supermarket
- shop
- preschool
A: supermarket
Explain how we arrive at this answer: 
Explanation: Supermarket has cashiers. Workers in a supermarket spend most of their time standing up. Workers of a supermarket do not get any rest. Supermarket is a building.