阅读下面短文，从短文后所给的A、B、C、D四个选项中， 选出可以填入空白处的最佳选项。

    My friend Samuel, who is a good runner, and I ran a 5K race last weekend. It was my first organized1. “You run ahead,” I said at the starting line. “You2?” he asked. “Go!” I said. “I'll see you at the3”

    Samuel took off, strong and full of energy. My4 hit the ground in a familiar pattern, and I5 it to the half-way point. My legs started to6 and my back hurt. 7, I wanted to give up but my spirit told me not to. I started to think I should have8 a shorter goal as the great distance was too much for me. I began to9 deciding to run the 5K race. I thought about all this while running. The road seemed very10.

    11 I ran along, my feet felt like lead(铅). It seemed as if I would 12 make it. I was so tired that I couldn't move a step further. I tried to13 myself by sayings. Some words appeared in my mind. They were “Do 14 by halves” and “To persevere(坚持) means victory”. They were 15 and they filled me with fresh energy. Anyway, I wouldn't quit. I 16 along. I eventually saw the white tent by the finishing line.

    Samuel was at the finishing line. When I 17 at the end, he put his arm around my shoulders and18 his hand for a high-five.

    I realized that19 you never give up, the goal you set can be reached. Above all, you just have to be20 and take one step at a time.

    When I was 8 years old, I once decided to run away from home. With my suitcase 1 and some sandwiches in a bag, I started for the front door and said to Mom, “I'm leaving.”

    “If you want to 2, that's all right,” she said. “But you came into this home without anything and you can leave the same way.” I 3 my suitcase and sandwiches on the floor heavily and started for the door again.

    “Wait a minute,” Mom said. “I want your 4 back. You didn't wear anything when you arrived.” This really angered me. I tore my clothes off—shoes, socks, underwear and all—and 5, “Can I go now?” “Yes,” Mom answered, “but once you close that door, don't expect to come back.”

    I was so 6 that I slammed (砰地关上) the door and stepped out on the front porch. 7 I realized that I was outside, with nothing on. Then I noticed that down the street, two neighbor girls were walking toward our house. I ran to 8 behind a big tree in our yard at once. After a while, I was 9 the girls had passed by. I dashed to the front door and banged on it loudly.

    “Who's there?” I heard.

    “It's Billy! Let me in!”

    The voice behind the 10 answered, “Billy doesn't live here anymore. He ran away from home.” Glancing behind me to see if anyone else was coming, I begged, “Aw, c'mon, Mom! I'm 11 your son. Let me in!”

    The door inched open and Mom's smiling face appeared. “Did you change your 12 about running away?” she asked.

    “What's for supper?” I answered. 

    “The way we choose to respond to others can cause them to feel ashamed 1can allow them to remember our kindness and2our stories with the future generations.” when I read this3 I thought of Doris, a very 4person. All around her room were dolls she had made: they were the most interesting dolls I'd ever seen.

    One day 5I was in her room, she took one of her dolls out of the case to6me, saying it was the7doll she had ever made. The doll was very unusual with fine artistic work. I was amazed that anyone could crate something so 8.

    Doris held the dolls very carefully. Then she slowly9the doll in such a way that I could see a10crack(裂缝)on the skirt. Doris said that on the way to class she bumped(撞击)the side of the skirt. She expressed how she was 11.When it was her turn to show the doll to the teacher, she pointed out the crack. Doris felt12that the doll would be13. Much to her surprise, the teacher told her she was just going to ignore the crack and 14the doll on the other good 15it had. Doris said this remark and16changed her life. She knew17the teacher hadn't overlooked the crack, she18had made the rest of the dolls.

    The teacher could have made Doris feel ashamed about the crack. But because of her19to ignore the crack, Doris was sharing her20to the next generation.

    Last week, Nicole Shen received a package from Amazon containing goods she had requested. She also found keys and an employee ID that had mistakenly found their way into her 1. At the sight of them, she knew she needed to get the 2 items back to their owner.

    After a little 3on social media, Nicole found out that they4Amazon employee Kenneth Delerme, who5 placed them in the box of items sent to Shen's Richmond, Texas home, about 150 miles away. Without his6, Kenneth had his car towed(拖) and was forced to sleep at a friend's apartment. So when Shen7to him explaining she had found his lost possessions, he was understandably 8. Throughout the course of their9on social media, Kenneth noticed people suggesting that he “swab(抽取血液样本)” as a way to10 Nicole. It was at that time that he got to know that Shen's 3-year-old son Roman. was diagnosed with a rare disease and was11 a bone marrow match(匹配的骨髓).

    In Roman's12, it means he can't produce white blood cells on his own. That means even a cold could 13 him. Therefore, the Shen family has been 14 a bone marrow match for Roman.

    Eager to 15, Knneth agreed to get swabbed and16persuaded several family members and friends to help as well. “All my friends and family are 17to help Roman or other people that need bone marrow,” he said.

    For Shen, this proves that despite the serious illness, the community isn't18 to help. And despite some cheats of social media, this story serves as yet another 19of how it can be used to do good and even save lives. Anyway, one good turn20 another.

    I believe that life's toughest lessons are best learned through personal experience. Throughout my childhood, my grandmother 1 me with unconditional love but always stressed, "You're not 2 than anyone else, but you're just as good as anyone. Treat others with 3, and you would earn respect 4.

    However, I never really 5 it until I was seventeen and got a summer job as a janitor. As I 6 floors and toilets, I watched people walk right by me and ignore my 7. This made me feel angry and wonder why they treated me so poorly.

    When I 8 to my grandmother, she offered me some words of 9 and reminded me never to forget the feeling of being "10" and to do the best job, because it was still my work, 11 which I should take pride. She added that it would make me a better man someday.

    Make me a better man someday? She must be 12, I thought to myself. But I needed the job to 13 college and there were few other jobs available, 14 I bit my tongue and kept on working as best as I could for the 15 of the summer.

    Today, when asked what job helped prepare me to gain the 16 of a key university, I tell people it was my summer job cleaning restrooms that 17 me as a man and, down the road, as an educator.

    As you can see, 18 can only be understood by walking in a lot of different shoes. So I suggest students 19 of their comfort zones and get deeply involved in different work and community experience. It's essential for people to find 20 in every person, no matter who they are or what they do for a living.

A friend who was depressed wrote me a letter a few weeks ago.He said his life was full of 1 and that his heart was full of worries.He was 2 about his life.He ended his 3 with this question:"We can't really change our life,can we?"As a famous musician,I 4 immediately and started my letter with these words:"Yes,we certainly can!"

I can still remember the first time someone 5 my life.When I was a child, I started to like 6 but I had no talent for any instrument.When I was 8,I went to a 7 with my parents.The 8 impression(印象) it gave me was a musician playing the guitar.She 9 so well.Later, my parents led me to 10 her.She let me try playing her guitar.I did my best 11 I couldn't play well."I played so badly," I said 12 .She looked at me with her kind eyes,smiled,and 13 me,"You played so well and I'm proud of you."Those 14 words changed me.They gave me 15 .They planted a seed(种子) in my mind that continues to 16 to this day.Her encouragement made me realize that I could do as well as her.From that day on,we became friends and our 17 lasts until now.

You have something inside of you that is 18 and that could change your life for the better.You just have to 19 it,bring it out and work hard at it.And that is what I have tried to do all of the years since that 20 day.Can you change the world?Yes,you can!You can change it and make it better every single day of your life.