选出正确的单词，把序号写在横线上。
1. A teacher works in a __________ (A. shop B. market C. school).
2. A clerk works in a __________ (A. school B. store C. restaurant).
3. A __________ (A. waiterss B. businessman C. clerk) works in a restaurant.
4. A waiter works in a __________ (A. store B. restaurant C. school).
5. A __________ (A. businessman B. doctor C. cashier) works in an office building.
