The job of a scientist is to find out the     1    （true）in the field of science. It is a     2    （challenge）profession. Scientists usually have to do thousands of     3    （experiment）in order to prove something.     4     they are often disappointed if they fail, most of them never give up. My next door neighbor is a scientist,     5     studies radiation.

He is always working in his lab,     6    （try）to figure out all the mysteries that make him     7    （puzzle）. When I met him the other day, he had just come back from work, looking excited. He told me he had had     8    breakthrough. He sounded so trilled. Then I noticed that he was wearing shoes that did not match. He must have been working     9    hard to notice! I think it's good to do a job that you are interested in. Otherwise you will get bored     10    （easy）.

2 . Jack worked for the Canadian government. One day he was told to learn more about wolves. Do wolves kill lots of caribou (北美驯鹿)? Do they kill people?

The government gave Jack lots of food, clothes and guns. Then they put him on a plane and took him to a lonely place. The plane landed, put him down and left. There were no houses or people in this place. But there were lots of wolves.

People tell horrible stories about wolves. They say wolves like to kill and eat people. Jack was afraid when he thought of these stories. He always took his gun with him.

Then one day, he saw a group of wolves. There was a mother wolf with four baby wolves. A father wolf and another young wolf lived with them.

Jack watched these wolves every day. The mother was a very good mother. She gave milk to her babies. She gave them lessons about life. They learned how to catch food. The father wolf got food for the mother. The young wolf played with the children. They were a nice and happy wolf family. Jack did not need his gun any more. In a short time, he got along well with the family. Jack watched them for five months.

Later Jack wrote a book about wolves. He wanted people to understand them and not to kill them.

3 . It's a popular belief that a fish's memory lasts for only seven seconds. It may seem sad to think that they don't remember what they've eaten or where they’ve been, and they don't identify you or any of their friends--every moment in their life would be like seeing the world for the first time.

But don't be so quick to feel sorry for them. A new study has found that fish have a much better memory than we used to think. In fact, certain species of fish can even remember events from as long as 12 days ago. In the study, researchers from Mac Ewan University in Canada trained a kind of fish called African cichlids to go to a certain area of their tank to get food.They then waited for 12 days before putting them back in the tank again. Researchers used computer software to monitor the fish’s movements.They found that after such a long break the fish still went to the same place where they first got food.   This suggested that they could remember their past experiences.

In fact. scientists had been thinking for a long time that African cichlids might have a good memory. An earlier study showed that they behaved aggressively(挑衅地) in front of certain fish, perhaps because they remembered their past "fights".But until the latest findings, there was no clear evidence.

Just as a good memory can make our lives easier, it also plays an important part when a fish is trying to survive in the wild. "If fish are able to remember that a certain area contains safe food, they will be able to go back to that area without putting their lives at risk,"lead researcher Trevor Hamilton told Live Science.

For a long time, fish were placed far below chimpanzees, dolphins and mice on the list of smart animals.But this study has given   scientists a new understanding of their intelligence.

I have been fond of playing chess for many years and I have made a rapid progress, for which I am proud. However, I came across the chess player on the Internet several days ago. While played, I was so eager to win. But because of my carelessness, I failed in the end, what got me crazy. I burst into tear. My parents looked at me in silence. Only when I calmed down they tell me that it was no use get angry when we met with failures. What we should do is to learn to control our emotions or try to do better next time. I was ashamed of what I did. “Never will I lose my temper again.” I told me.

If you live in northeastern China, you expect long, cold winters. People     1    (live) in Harbin don’t just stand the cold, however, they welcome it. The city is home to the Harbin International Ice and Snow Sculpture Festival,    2    is considered to be the largest ice festival in the world. Even with temperatures usually close to zero, thousands of people head to city parks     3    (see) great ice sculptures, many bathed in colored lights.

The festival includes several thousand ice sculptures. Some of these works are the recreations of castles, historic landmarks and famous people, lit up at night in bright colors. There     4    (visitor) can climb ice stairways and go down ice slides (滑坡). They can also take part    5    sporting events, including skating, ice football     6    well as ice swimming.

The city started     7    (it) icy event in 1963 with the Ice Lantern Garden Party, a     8    (celebrate) of the tradition of creating lanterns out of blocks of ice. The larger festival     9    (begin) in 1985 and added sculptures, which have grown in number and size over the years. As it has gotten bigger, the festival has become popular outside the city.    10    (official), the festival starts on January 5th and lasts over one month.

7 . In January, 2016, Harry Styles made a brave decision. He_________the popular boy band One Direction and went solo(单飞). Now he is making his own_________heard. The 23-year-old British singer released his first solo single called Sign of the Times. His self-titled(个人同名)album is_________on May 12.

Going solo is a_________for him to find his identity. Though at the time, he was_________about his future, he kept the word "honesty" in his_________. "I didn't want to write '_________'," he told Rolling Stone. "I wanted to write my stories, things that_________to me. The number-one thing was that I wanted to be_________. I hadn't done that before."

He has been__________full of stories since beginning his solo career. Last fall, he spent two months recording on a remote island in Jamaica. Along with some__________, he filled a two-floor house with instruments. They hung out at the bar that__________a tree house. Many mornings began with a swim in the river down the hill.

They watched many__________comedies such as Roman Holiday. Styles always held a black__________and looked like a college student who was studying, Rolling Stone reported.

His coming__________is about rock music.__________, he grew up with it. His father Desmond was a__________music fan. When Styles was very young, he danced to The Dark Side of the Moon, a classic song by British rock band Pink Floyd. "I couldn't really get it. But I just__________this is really cool."

Harry said, "At the very beginning, all I__________was to be the grandfather with the best stories."__________, now he is on the right track.

8 . Experts advise that teens get 60 minutes or more of moderate(适度的)to energetic physical activity each day.    1    

Exercise benefits every part of the body, including the mind. Exercising causes the body to produce chemicals that can help a person to feel more peaceful and happy.    2    It can also help some people who have mild depression and low self-esteem. Plus, exercise can give people a real sense of success and pride at having achieved a certain goal-like beating an old time in the 100-meter dash.

Exercise can help you look better.    3    In fact, exercise is one of the most important parts of keeping your body at a healthy weight.

    4    Exercising to maintain a healthy weight cuts a person's risk of developing certain diseases, including type 2 diabetes(糖尿病)and high blood pressure. These diseases, which used to be found mostly in adults, are becoming more common in teens.

Exercise can help a person age well.    5    Women are especially prone(往往)to a condition called osteoporosis(骨质疏松症)as they get older. Studies have found that weight-bearing exercise-like jumping, running, or fast walking-can help girls(and guys) keep their bones strong.

Thank you so much for your kind invitation to exhibition, "Ancient India", which was now on at the local museum. I'd love to join in you.

I'd be particular happy to watch this exhibition because the brilliant Indian culture has always been mysterious but attractive to me. India is an old civilization just like China. It will be excited to see all the exhibits that have traveled so a long way to China! With me as a companion, it's a chance to have a good understanding of Indian people's life. Let's meeting at the entrance to the museum at 9:30 am on Thursday, July 23.

Best wishes!

Yours,

Li Hua

For 300 years, the Slims River had been flowing through Canada's Yukon region. But last year, in only four days, the water in the big river reduced sharply,    1    made the river almost disappear. What happened?

After a year of careful studies, a group of    2    (scientist)recently said that the sudden change of the river    3    (cause)by climate change, reported The Guardian.

The Slims River used    4    (be) a big river, reaching up to 150 meters at its    5    (wide)points. It carried meltwater from the huge Kaskawulsh glacier into the Kluane River, then into the Yukon River toward the Bering Sea.

But in spring 2016, there was a sharp melting of the Kaskawulsh glacier because    6    climate change. It redirected the meltwater into    7    second river, the Alsek River, then into the Gulf of Alaska.

In geography, this is called "river piracy",    8    (mean) the flow of one river is    9    (sudden) taken away into another. Although it was not unusual in ancient times, this is the first time it    10    ( happen) under scientists' noses in modern times.