a drink on the house的用法和样例：
- The landlord gave us a drink on the house.
- It was the pub landlord's silver wedding anniversary the other day and he gave all his regular customers a drink on the house.
- Malcolm offered his regular customers a drink on the house on his birthday.
- The child often had a drink on the quite.
- Drinks on the house are illegal.
- The police shone a searchlight on the house.