下列句中加点的成语，使用错误的一项是 （ ）

lice are offering ______ reward of$50,000 for information leading to the arrest of _____ murderer.

He had to help his parents ________ on the farm on weekends.

The car is ______ expensive. I don’t have ______ money to buy.

I want to see the movie The Mermaid. Do you know the __ _ of the ticket—It’s not very expensive. It’s well worth seeing.