根据对话内容，从方框中选择恰当的词语填空

should，might，why not，could

A：Jill, you  ask someone to paint the house this year.

B：Yes．It's beginning to look dirty. I don't have enough money, though. Do you think I try to borrow some?

A：No, you shouldn't. You have a problem paying it back.

B：I should do something about the roof(屋顶), too.It leaks(漏)when it rains hard.

A：Really? repair it now? Maybe you call someone today and ask them to look at it.

B：Yes. You're right.