阅读下面的短文，理解其大意，并从 A、B、C、D 四个选项中选择一个能填入空白处的最佳选项。
Last summer, I volunteered at an elderly care center in my city. At 1, I was nervous because I didn't know how to communicate with the old people properly. But soon I realized that they were just like my grandparents—friendly and 2. I like to stay with them.
Every Saturday morning, I helped clean the rooms and 3 meals for the elderly. Some of them couldn't walk 4, so I also helped them move around. One old lady, Mrs. Chen, told me many 5 about her youth. She said she 6 a teacher for over 40 years. I was deeply moved by her stories. She also showed me old photos and pointed at her students with pride.
The center often 7 activities like singing and paper-cutting. Many elderly people 8 in these activities happily. One day, we 9 a small party. I performed a folk song, 10 everyone clapped along. Mrs. Chen even danced 11 her wheelchair! I will never forget that moment. Her eyes sparkled like stars. Besides these activities, I also helped read newspapers to the elderly with poor eyesight. One grandpa loved history, so I read stories about ancient China to him every week. He listened so carefully that sometimes he even corrected my pronunciation. We became good friends.
Through this experience, I learned that volunteering is not just about 12 others. It also helps us 13 new skills and understand the value of kindness. The old people there 14 love and care, just like everyone else. They may walk slowly, but their hearts are still young and full of hope.
Now I plan to volunteer at the center every holiday. I believe small acts of kindness can make a big 15. If everyone gives a little, our society will become much warmer.
()1. A. first B. last C. once D. least
()2. A. warm-hearted B. cold C. serious D. strange
()3. A. cooked B. bought C. sold D. ordered
()4. A. slowly B. easily C. loudly D. quietly
()5. A. jokes B. stories C. lies D. problems
()6. A. is B. were C. has been D. had been
()7. A. organized B. found C. visited D. watched
()8. A. liked B. took part C. came D. went
()9. A. held B. made C. played D. took
()10. A. but B. or C. and D. so
()11. A. in B. on C. with D. under
()12. A. helping B. teaching C. asking D. leaving
()13. A. lose B. learn C. forget D. miss
()14. A. need B. hate C. refuse D. avoid
()15. A. decision B. plan C. promise D. difference

1-5 AAABB 6-10 DABAC 11-15 AABAD

1. 考查固定短语。at first意为“起初、一开始”，符合后文“很快我就意识到老人很友好”的转折逻辑，对应一开始我紧张的状态，选A。
2. 考查形容词辨析。and连接并列的褒义描述，前文提到老人们像自己的祖父母、性格友好，warm-hearted（热心的）符合语境，cold（冷漠的）、serious（严肃的）、strange（奇怪的）均不符合，选A。
3. 考查动词辨析。作为志愿者，我帮忙打扫房间，还为老人们做饭，cooked meals符合场景，bought（购买）、sold（售卖）、ordered（点餐）均不符合志愿活动的行为逻辑，选A。
4. 考查副词辨析。后文提到我帮助他们挪动，说明部分老人走路并不轻松，easily（轻易地）符合语境，slowly（缓慢地）、loudly（大声地）、quietly（安静地）均不符合，选B。
5. 考查名词辨析。后文明确提到“我被她的故事深深打动”，说明此处是她给我讲很多年轻时的故事，选B。
6. 考查动词时态。“当老师超过40年”这个动作发生在她给我讲故事这个过去动作之前，属于“过去的过去”，要用过去完成时had been，选D。
7. 考查动词辨析。养老院经常组织唱歌、剪纸这类活动，organize activities是固定搭配，意为“组织活动”，选A。
8. 考查固定搭配。take part in是固定短语，意为“参加（活动）”，符合老人们开心参与活动的语境，选B。
9. 考查固定搭配。hold a party是固定短语，意为“举办派对”，此处用过去式held，选A。
10. 考查连词辨析。“我表演了一首民歌”和“所有人都跟着鼓掌”是顺承关系，用and连接，选C。
11. 考查介词辨析。in one's wheelchair是固定表达，意为“坐在轮椅上、在轮椅里”，符合语境，选A。
12. 考查动名词辨析。志愿活动的核心是帮助他人，about是介词，后接动名词helping，选A。
13. 考查动词辨析。志愿活动也能帮我们学习新技能，learn new skills符合语境，选B。
14. 考查动词辨析。老人和其他人一样，需要爱与关怀，need符合语境，选A。
15. 考查固定短语。make a big difference是固定搭配，意为“产生巨大影响”，符合“小小的善举能带来很大改变”的句意，选D。