阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。
My name is Peter, and I use a wheelchair to get around. This year I 1 to be in the School Walkathon.
At the Walkathon last year, I helped hand out drinks to the walkers. The teachers and parents said they couldn't have 2 without me.
"Are you going to give out drinks 3 this year?"my friend Michael asked.
"I 4 so," I said." But I 5 wish I could do laps(跑道的圈) with you."
Michael told Mrs Hunt that I wanted to 6 the Walkathon. Mrs Hunt looked at me. "It's not a good course for a wheelchair, "she said. "The hilly part would be too 7. "
"But I could push Peter over the hard bits, "said Michael.
"I'll 8 it," said Mrs Hunt.
That afternoon, Mrs Hunt called a class meeting. Michael told everyone about his 9.
"We could all take turns. That way no one would get too 10, "said Olivia. Then everyone said they would take a turn.
When the Walkathon began, I turned my wheels round and round as 11 as I could. When we came to the hilly bit, Michael 12 to push me up it. Olivia was waiting halfway up. "My 13 now," she said. With all the help my 14 were giving me, I 15 the first lap and did a second lap—and another. I was tired in the 16.
"It's time to announce the winner of the mystery prize. It goes to . . . Peter!" Mrs Hunt said.
I looked at all the things I had 17, and felt extremely 18. But then I remembered that the whole 19 had helped me.
"I want everyone to 20 the prize," I said. "Let's keep all the things in our classroom. Then we can all have some fun!"
And that's what we did.