根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。
Alison cornered me in the kitchen. “Daddy, I really want a rat.”
"Again?” I saw the ugly grey things with round eyes and long tails in my mind. She wanted one of those in our 1?
“No, Daddy, a pet rat kept at home."
This topic was around in our family for about one year. This time, Alison told 2 seriously how she would take care of the rat herself, how she would learn to be 3 by doing so. I wanted to say “no” as usual, 4 it was not the right response for this situation. I suggested that Alison should 5 me that she would be responsible by researching some basic questions we had about 6 : How much do they cost? What care do they need?
I thought the answers she found 7 change her mind. Alison searched for information and made many notes. She learned 8the best cage for rats is and what types of food they can (and can't) eat. She learned that two rats are 9 than one — they like staying together.
Alison proved herself with her efforts, so I 10 finally. If she continued to do so, caring for the rats and preparing food for them, she would learn the responsibility we always wanted her to have.
We 11 several pet stores, asking for baby rats. One store told us it just received some that would be ready on sale in a week. Alison was so 12 — her dream would come true soon.
On Sunday afternoon, I drove Alison there. I must say, 13 seeing the rats, I found they were much cuter. Alison 14 picked out two little ones with her soft little hands. She cradled the cage with them, 15. We went back to our car, and huge smile was still on her face.
“I can't believe I have them after a year of begging!"
“It wasn't your begging,” I told her. “You showed me you were responsible so I wanted to reward that.”
