Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: Irene Morrison, a working class mother of two boys, lives in Upstate New York and works as a supermarket cashier. She also harbors a cocaine addiction. Her eldest son, Ben, whose birthday is approaching, asks Irene to buy a snake for him; she suggests Lego instead. On the night of Halloween, Irene takes her kids trick-or-treating and, at one of the houses they visit, she meets Bob, a nurse.
Later that night, her husband Steve arrives home with a toilet, announcing he's going to build them a second bathroom. In bed, Steve tries to initiate sex, but Irene says she doesn't feel very sexy. She changes the subject back to decorating their bathroom. The next day, Irene takes the kids to a reptile store to buy a snake, but finds that they don't have enough money for one. While her boys wait in the car, Irene visits her dealer, asking him for another fix, but he refuses since she hasn't been paying for the last couple of weeks.
At work, Irene contemplates taking money from the cash register. She then goes back to her dealer with Ben's birthday check from her mother-in-law, but the dealer refuses to take it. Afterwards, Irene checks herself into a drug rehabilitation center. At a meeting about cravings, she meets fellow addict Lucy, and befriends her. While at the facility, Irene again encounters Bob. Before she leaves, Bob visits with a book that helped him during his quitting phase, and offers her his support.
What has Ben's mother been not been paying for?