You have to change the structure of the sentence without changing its meaning. Use the word given. Example:
You ought to spend more time reading. (DON'T ) Why … more time reading?
Answer: don't you spend
1. Reading that book wasn't worth the money we spent on it. (WASTE) Reading that book ... money.
2. Every Sunday, she has a 50-minute journey to get to the museum. (TAKES) It ... to get to the museum.
3. Having the house painted cost them a lot of money. (SPENT) They ... having the house painted.