A、He painted it. B、He renovated it. C、He decorated it. D、He altered it. D

W: I’m very impressed by all the work you’ve done on your house, Mr. Sloane. How long have you been working on it?
M: I first became interested in DIY several years ago. You see, my son Thomas is disabled. He’s in a wheel-chair and I just had to make alterations to the house. I couldn’t afford to pay workmen to do it. I had to learn to do it myself.
W: Had you had any experience of this kind of work? Did you have any practical skills?
M: No. I got a few books from the library but they didn’t help very much. Then I decided to go to evening classes so that I could learn basic carpentry and electrics.
W: What sort of changes did you make to the house?
M: First of all, practical things to help Thomas. You never really realize the problems handicapped people have until it affects your own family. We used to live in a flat, and it was totally unsuitable. Just imagine the problems a disabled person would have in your house. We needed a large house with wide corridors so that Thomas could get from one room to another. We didn’t have much money and we had to buy this one. It’s over 90 years old and it was in a very bad state of repair.
W: Where did you begin?
M: The electrics. I completely rewired the house so that Thomas could reach all the switches. I had to lower the light switches.
M: What else did you do?
W: By the time I’d altered everything for Thomas, DIY had become a hobby. I really enjoyed doing things with my hands. Look, I even installed smoke-alarms.
M: What was the purpose of that?
W: I was very worried about fire. You see, Thomas can’t move very quickly. I fitted them so that we would have plenty of warning if there were a fire. I put in a complete burglar-alarm system. It took weeks. The front door opens automatically, and I’m going to put a device on Thomas’ wheelchair so that he’ll be able to open and close it when he wants.
M: What are you working on now?
W: I’ve just finished the kitchen. I’ve designed it so that he can reach everything. Now I’m building an extension so that he will have a large room on the ground floor where he can work.
W: Here’s a 10,000-pound prize. How are you going to spend it?
M: I’m going to start my own business so that I can convert ordinary houses for disabled people. I think I’ve become an expert on the subject.
19. What has Mr. Sloane done to his house?
20. Why did Mr. Sloane do something to his house?
21. According to Mr. Sloane, what will he do with the money he has won?
22. How much is the prize?