Ollie Simmons was good at maths, but Ruby Riley wasn’t. Well, Ruby didn’t think she was. She s    1     (坐) next to Ollie and so she just copied him. This was the best way she had found to do maths and she didn’t have to think at all.

One day the teacher said, “We will be having a maths test after lunch.” Ruby f    2     (感觉) there were butterflies in the stomach. “Can I copy off you?” she whispered to Ollie. Ollie thought for a minute. “What will you give me?” he whispered back. Ruby s    3     (给……看) Ollie a stone she had. It was r    4     (圆形的，球形的) and smooth and the colour of the sea. “OK!” he said, “Give me the stone, and then you can copy my answers.” Ollie got full marks in the maths test and so did Ruby. Their n    5     (名字) went on the top of the maths champion chart.

Every week there was a maths test and every week Ollie and Ruby got full marks together. Ollie had to s    6     (分享，共享) the top place with Ruby, but it was worth it. He had a torch, a key chain, a g    7     (高尔夫球) ball and a gift box!

One day, there was a maths test again. This time, Ruby picked a watch, t    8     (认为，以为) everything would go as usual—Ollie would let her copy and they would be on the top of the chart together again. But she was wrong. The headmaster came into Ruby’s class. “I want to see Ollie Simmons,” she said. Ollie was gone for a long time. Then the door o    9     (打开). It was the headmaster again. “Ruby Riley,” she said, “Come with me, please.” Ruby felt like a bird in a c    10     (笼子)—there was no way to escape. The headmaster told Ruby that every lunchtime for five weeks she had to do maths. “You have to learn to think for yourself,” she said. “And Ollie has to learn a lesson, too. He’s going to teach you.”

First, I had to think very carefully about    1    I wanted to take. The school adviser helped me choose     2    : maths, English, chemistry, world history, and Chinese. I know that Chinese is a very difficult language, but I    3    when I graduate. My adviser    4    that I should    5         6    because I like English and I’m good at it.

I know I’ll have to study harder as a senior high student and get used to    7    a lot more.I’m a bit worried about    8    the other students in my advanced course and it would be quite difficult to get used to all the homework. Still, T’m happy to be here. Studying hard isn’t always fun, but I’ll    9    university or     10    in the future.

…However, whether it was possible to develop a hybrid of self-pollinating plants such as rice was a matter of great debate. The common     1     then was that it could not be done. Through     2     effort, Yuan overcame enormous technical difficulties to develop the first hybrid rice that could be used for farming in 1974. This hybrid     3     farmers to expand their output greatly.

Through Snow’s tireless efforts, water companies began to sell clean water and the threat of cholera around the world saw a     1         2    . However, cholera is still a problem. Each year, millions of people around the world get cholera and many die     3     it. Fortunately, we now know how to prevent cholera, thanks to the work of John Snow. Moreover, in his use of maps and     4    . Snow     5     the way scientists study diseases. For this reason, Snow is considered the father of modern epidemiology.