根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    After their 15-year-old pet dog died, Rain and his wife, Ann, looked for months to find the right new pet. "I love dogs." said Rain, a worker at a health club in New York. "I can't 1 not having one.

    "Finally, the couple found a lovely young 2 and decided to 3 him home. They named him Little Sheep. Little Sheep quickly made himself at home, sleeping on his new 4 bed at night.

    With heart disease for 25 years, Rain 5 look his medicine four times a day and always had no problems. 6 on March 17, he took the wrong amount(数量) of medicine before he went to sleep. When he got out of bed to 7 the bathroom at night, suddenly, he felt his heart beating fast and later fell to the floor heavily.

    "Little Sheep was usually very 8 and well-behaved," said Ann. "But when my husband hit the floor, the dog gave a loud cry like a wild animal. I was woken but didn't know what was happening. Then l saw my husband 9 on tile bathroom floor. I ran for the 10 and called a hospital at once. "Rain spent several hours in the hospital. By 6:30 a. m., he had been 11 enough to go home. "It surprises me that Little Sheep has such great 12," said his thankful owner. "He's becoming a calm little gentleman. We can walk him on our street, unleashed(未拴住的), without any problem. He's got a lot of 13 now, and everyone wants to 14 him kindly. "

    "We feel the name Little Sheep is not good enough," said Rain. "So now we call him Big Hero, more 15 for an animal of his ability. "

    Time flies like an arrow. What is your most unforgettable experience in the year 2014? Three teen's readers want to 1 their stories with you.

    Ji Luyang, 13, from Jiangsu: This summer, I went for a budget trip(穷游) with my father to northern China. We took 2 instead of plane. Hard seat tickets were our 3 choice.  We were happy because we 4 the money for a hotel even though the time on the train was uncomfortable. After the trip, I have become an expert on saving money.

    He Zhuowen, 14, from Shanxi: The biggest thing for me this year is that I have made a new friend from Taiwan. Her name is Zou Mianzhi. She is of the 5 age as me. I learnt a lot about schools in Taiwan from Zou. For example, they take logic class andhome economics(家政) class, which are new to 6. Now we still talk about our lives by WeChat(微信) every day.

    Zhang Yaozhi, 14, from Shanghai: In 2014, I tried teaching for the first time in my life. It was

    7 of our school's community activities. Before, I thought it was easy,8 I was wrong. To prepare lessons, I had to 9 until midnight. From this experience I came to understand our teachers 10. It is really frustrating when you speak on the platform but nobody listens!

    One day, the students of Class 6 were reading in the classroom. Mrs. Brown came in and told the whole class they would have to change the 1 the next week. All of the students disagreed 2 Mrs. Brown, so they shouted when Mrs. Brown said it was because a new student would 3 the class. "Why must we move to another classroom just because someone new is coming?" One of them asked 4. Mrs. Brown stood there without saying anything. After a few minutes, she told them to be  5 to their new classmate and then she left.

    The following week, the head teacher, Mr White himself brought the new student to their class. 6,he pushed the new student to the class because the student was in a wheelchair(轮椅). Mr. White introduced the new student Jeff to the class. He said that Jeff now was a 7of the class and they should work together. He added," Helping each other is very important. " 8 could fully understand what Mr. White meant at first.

    Over time, they began to understand the reason. Jeff was a9 student and often helped the students who didn't understand their work. The class felt very thankful to him. They took care of him because they knew that when someone did something for you, you should do something 10 in return.

    Kierman was born in Sydney, Australia, and grew up near the sea. For more than 40 years, he raced in international sailing competitions.

    In 1987, Kierman was competing in an around-the-world race when he began to1the huge amount of rubbish in the world's oceans. When he returned to Australia, he 2to do something about it.

    He organized a community3 called "Clean Up Sydney Harbour." On Sunday, January 8, 1989, more than 40,000 volunteers came out to 4away rubbish. The next year, Kierman made the clean-up a national event. It was a huge 5. Across Australia, about 300,000 people spent the day improving their local6.

    Since then, "Clean Up Australia" has got7every year. In 2002, for example, 800,000 people cleaned up almost 15,000 tons of rubbish from Australia's beaches, parks and streets.

    Kierman was 8 with the success of his project. In 2003, he started an even bigger program. With the 9of the United Nations Environment Program, he introduced "Clean Up the World", an international program that supports communities around the world in cleaning up and protecting the environment. "Clean Up the World" has grown 10and his wonderful idea has now spread from one city to the whole world.

    Two years ago, Matthew Nonnemacher's teacher asked her students to think of one wish. Matthew didn't have to think too 1. He drew a picture of himself giving money to a 2 person.

    Drawing a picture is easy, of course. But Matthew did much more than that. He 3 to start to collect pennies (便士)."I think almost everyone has extra (额外的) 4," said Matthew. He knew that if most people liked to give away a penny, the pennies could 5 up. He wished that he could collect $10,000.

Matthew started his work 6. He put penny boxes in schools and supermarkets. He also went on TV to 7 people to give away their pennies. When Matthew finished the work, he collected more than $18,000 in pennies.

Matthew gave away his 8 to the United Way. The United Way gives a lot of 9 to people in need. Matthew made his 10 come true with his own hard work.