问题补充：
---How much is this painting?
---I 10,000 francs on it.
A. cost; spend
B. worth; spend
C. cost; gave
D. take; paid
答案：
A. cost; spend
(答案→)B. worth; spend
C. cost; gave
D. take; paid
解析：表示“值多少钱”，与be 动词连用的只有形容词，至于“花了多少钱”，可以说pay,也可以说spend，但为介词on 连用的只有spend.
