从每小题所给的A、B、C三个选项中，选出可以填入空白处的最佳答案。

    Jadav Payeng is a forestry worker from Jorhat, India. Over the past 38 years, he has planted trees on a sandbar (沙洲）of the Brahmaputra River and has1it into a forest.

    One day in 1979，16-year-old Payeng was walking2the bank of the Brahmaputra River. He saw many snakes on the sandbars. These snakes died in a few days' time3the heat and the absence of trees. Payeng felt very4 when he saw this. He decided to plant some trees. Single-handedly, he started planting bamboo trees, as only bamboo trees could survive (存活）in the sandbars.

    To water the trees was a difficult5for one man. With his hard work and great effort, day by day the6bamboo trees grew into a forest. His tree planting has changed the soil (土壤).Now the sandbar is a thick forest and7to thousands of plants and animals. A large group of around 100 elephants visit the forest every year and8there for a few months.

    Payeng is now in 9fifties. He has planted close to 1,400 acres (英亩)of forests and is10as the Forest Man of India. In 2015，he was honored with Padma Shri, one of the top awards in India.

There was a bridge crossing a big river from west to east. It1a man five minutes 2 it. There was a pavilion(凉亭)3the middle of the bridge with a soldier4. He came out5three minutes.6he saw somebody crossing the bridge, he would tell him to go7, not permitting(限制)him to cross. A clever man thought of a8idea, and crossed the9at last. What10did the clever man think of to cross the bridge?

    Having brothers or sisters means owning the most expensive gift in the world. With them, we do not have to live a 1 life and we can also learn a lot from them.

I 2 in a blue-collar (蓝领的) large family a few miles into the countryside outside Chicago. There were four 3 in my family and my parents lived a hard life to bring us up. Among all my sisters, Cynthia, who is four years older than I, has 4 me the most. Cynthia has never 5 to be different. She has always dared to point the unfair things out and 6 the way things were around us, trying to change the negative (消极的) situations through her own efforts. She has always had the 7 to look at life from a different and unusual perspective (角度). That made me 8 her very much. Her example gave me the courage to question things like her and taught me to explore my own world 9.

    Now we're both old 10 we're still exploring. We 11 a lot together each year and this year we're going to visit a few African countries. After experiencing more and more, I realize that it's great to grow old because without work to 12, you have more time to take trips and have adventures, like we are now. Cynthia and I have always been 13, and now in our 60s, we still keep a good relationship as ever. I'm so grateful to have such a sister.

    Do you have any brothers or sisters? If you do, you're in 14. They will be your lifelong wealth. Please 15 your time together and be a positive role model for the younger ones.

A beautiful smile

    When I was thirteen years old, a girl gave me an important gift. It was a smile.

    It was the early autumn of my 1 year at a new school. It's also the first year of middle school. No one knew me. I was very 2, and afraid to make friends with anyone.

    Every time I heard the other students talking and laughing, I felt even more lonely. I could not talk to anyone about my problem, and I didn't want my parents to worry about me.

    One day, my classmates were 3 with their friends, but I sat in silence(沉默) and felt so down that everything didn't sound real. At that moment, a girl entered the classroom. I did not know who she was. She passed me and then turned back. She looked at me and, without a word, 4.

    Suddenly, I felt the 5 of something bright and friendly. It made me feel happy, lively and warm. It was like a hidden treasure(宝藏).

    That smile 6 my life. I started to talk with other students. Day by day, I learnt to trust people, and they included me in their circle of friends. The girl with the bright smile has become my best friends now, and we stick together like glue. I can talk to her about my study, feelings and hobbies, pretty much everything. I am so 7 that I met such a nice girl.

    One day, I asked her why she smiled at me that day. She said she could not remember!

    Now I believe that the world is like a 8. It is just what you think it is. If you think you are lonely, you might always be alone. But if you smile at it, it will always smile back!

    Jim is the son of a farm owner. On New Year's Day, when he was 15 years old, his father 1 him to work on the farm for one year at his free time. Jim was 2 with his father's idea. "That isn't my job. I have 3 school work to do." At hearing this, his father said, "I promise(答应) to give you the best present if you 4 finish one year's work." Jim thought for a while and 5.

    Starting one Saturday, the boy got up early and worked 6 until evening, just like any other farmer.

    Time passed 7. Jim's crops grew very well. On the last day of the year, the father called his son to him. "I'm happy to see that you have worked very hard the whole year," said the father. "Now, tell me 8 you want."

    The boy smiled and showed his father a big piece of bread made from his wheat. "I've already got the 9 present. No pains, no gains. I think this is what you wanted me to 10."