The money collected from ticket sales could be food and clothes for the people in the flo

问题补充：

The money collected from ticket sales could be food and clothes for the people in the flooded areas.

A. cost

B. paid off

C. spent on

D. paid back

答案：

A. cost

B. paid off

(答案→)C. spent on

D. paid back

解析：考查固定搭配。句意“门票收入可以够洪水灾区的人们的生活费了。”cost的主语是物，pay off“支付，付款”；spend +money on sth.；pay back“偿还，报答”。本句用的是被动语态，The money作主语，故用spent on。故选C。