The Amber Room, one of the greatest     1     (wonder) of the world, was a great work that took about ten years     2     (make). In 1716, the Amber Room was given to the Russian people as a gift of friendship by William I, who loved soldiers more     3     the Amber Rootn itself. In Russia, the room first served as a small reception hall for     4     (importance) visitors,     5     later was moved and redesigned by Catherine II.     6     (fortunate), the Amber Room disappeared when the Nazi Germans and Russia were at war and until now nobody knows     7    happened to it. In 2003, however, a new Amber Room     8     (build)by the Russians and Germans on the basis of the old photos     9    (be) ready for the people of St Petersburg when they celebrated the 300th birthday of     10    (they) city.

A clay pig     1     (find) in Lianhe Ruins in Sichuan province in 2019. It is estimated to be about 3,000 years old.     2     makes this finding unusual is its adorable appearance. The clay pig looks exactly like the green pig from The Angry Birds movie.     3     (it) cute image has left the Chinese netizens surprised and delighted, with many people joking that The Angry Birds character has traveled back in time to prehistoric days. The topic     4     (attract) 400 million views and 290,000 discussions since the pig was discovered.

How Dolly was born

Professor Wilmut's experiment involved three adult female sheep. He first     1     (take) a cell from sheep A, He then implanted (植入) the genetic information into     2     (it) nucleus (细胞核) with an egg cell from sheep B, whose nucleus had been removed. Tiny electric shocks     3     (use) to stimulate ( 激 发 ) this new “combination” egg cell to divide.     4     (final), the new embryo was implanted into the body of sheep C, where it developed just like any other sheep embryo.

In 1996, his determination and     5     (patient) paid off. Dolly became the first sheep to be born without a father and was also the first genetically     6     (identity) copy of an adult. As the egg cell gradually splits, its millions     7     offspring cells specialize into muscle cells or skin cells, for example,     8     (mouse) and cattle have now also been cloned from an adult. These clones have also been cloned, producing three generations of healthy clones.

    9     was thought that a specialized cell could never become a different cell, with all the genetic instructions     10     (form) the entire creature.

In advance of the Allied landings at Normandy, the British planned the aerial bombing of the Amiens Prison in northwest France.

On February 18, 1944, 18 of the legendary Mosquito fighter-bombers (蚊式轰炸机) carried out the plan     1     (free) the 700 French Resistance members     2     (lock) up there. The weather that day was so bad that one of the pilots thought     3     a tough task it was . However, the group still     4     (fly) across the English Channel at just 15 meters above the waves, though five had to turn back due to radio and engine problems. Now down to 13 planes, Group Captain Charles Pickard carried on     5     the raid.

At 12:01 pm, the bombers attacked the prison wall to allow the prisoners     6     route of escape. They went on to destroy the blocks where German officers were standing guard, many of     7     were killed or wounded. Two Mosquitos also attacked the nearby train station,     8     (buy) the prisoners time while the German soldiers were distracted. Only two aircraft were lost in the attack. While 258 prisoners escaped, 102     9     (kill) in the raid and another 155 were caught and kept as prisoners. Even today the sheer skill and courage shown by the Mosquito pilots are considered to be     10     (true) admirable.

For centuries, people dreamed about leaving Earth and travelling to other worlds. Then, in 1957, the Soviet Union     1    （make） the first small step into space     2     sending up a small satellite called Sputnik.

Early space activities were conducted     3    （main） by the United States and the Soviet Union. But as time went by, Europe and Japan also learned how to build     4    （they）own satellites and rockets. Today, countries such as China, India, South Korea, Israel and Brazil are also developing space industries.

During the last 60 years, unmanned probes（探测器）have been sent towards many of the planets     5    （exist） in the Solar System. Many space observatories, such as the Hubble Space Telescope, have been created to look at the     6    （distance） universe. They have sent back some amazing pictures taken in visible（可见的）light. And they can also observe stars that are invisible to human eyes. The flood of     7    （discovery）has changed the way we look at the universe.

More than 500 people have flown in space since Yuri Gagarin paved the way in 1961. 20 people have travelled to the moon, 12 of     8     have walked on the moon. So far, space stations       9    （build）, and astronauts have learned to live and work in space for many months     10       even years.

SPACE:THE FINAL FRONTIER

“Are we alone? What's out there? ”    1     (look) up at the stars, people have always wanted to learn more about space, and scientists work hard to find answers. They make     2     (vehicle) to carry brave people into space to find out the secrets of the universe.

Before the mid-20th century, most people felt travelling into space was an     3     (possible) dream.     4    , some scientists were determined to help humans realize their dream to explore space.

On 4 October, 1957, the Sputnik 1 satellite     5     (launch) by the USSR and     6     (success) orbited around Earth. Afterwards, the USSR focused     7     sending people into space, and on 12 April, 1961, Yuri Gagarin became the first person in the world     8     (go) into space. Over eight years later on 20 July, 1969, American astronaut Neil Armstrong     9     (step) onto the moon, famously saying,“That’s one small step for (a) man, one giant leap for mankind.” Following this, many more goals were achieved. For example, America's NASA space agency launched Voyager 1 on 5 September 1977 to study deep space,     10     it still transmits data today.

At 3:42 a.m. everything began to shake.     1     seemed as if the world was at an end! Eleven kilometers directly below the city one of the greatest     2     (earthquake) of the 20^th century had begun. It was felt in Beijing,     3     is more than two hundred kilometers away. One–third of the nation felt it. A huge crack that was eight kilometers long and thirty metres wide cut across houses, roads and canals. Steam burst from holes in the ground. Hard hills of rock became rivers of     4     (dirty). In 15 terrible seconds a large city     5     (lie) in ruins. The     6     (suffer) of the people was extreme. Two-thirds of the people died or     7     (injure) during the earthquake. Thousands of families were killed and many children were left     8     parents. The number of people     9     were killed or     10     (serious) injured reached more than 400,000.

Several days before July 28,1976, many strange things happened in Tangshan. The water in the village wells     1    (rise) and fell. In the city, the water pipes in some buildings cracked and burst. They were     2    (sign)for the earthquake. But people in the city didn't think much     3     these events. At 3:42 am that day, the earth began to shake,     4     destroyed the city. Many people,     5     (include) rescue workers and doctors, came to rescue those     6     (trap) under the ruins.     7     (late) that afternoon, another big quake struck Tangshan. More people     8     (kill) or injured and     9     (many) buildings fell down. Soldiers were called in to help the rescue workers. Team were organized to dig out     10     trapped and to bury the dead.

Because this was Li Qiang's first trip, he was worried and     1    （settle）so that he suffered from "time lag".     2    （hit）by a lack of fresh air, his head ached. His guide gave him some green tablets and a mask which helped him solve the problems. However, he experienced something new.     3    （arrive）home, he was shown into a large, bright clean room     4     a wall of trees.     5    （exhaust）, he slide into bed and fell fast asleep.

Wales was linked to it in the thirteenth century. Now when people refer to England you find Wales     6    （include）as well. Next England and Wales     7    （join）to Scotland and the name was changed to "Great Britain".     8    （happy）this was accomplished without conflict. Finally the English government tried to form the United Kingdom by getting Ireland connected in the same peaceful way. However, the southern part of Ireland was     9    （willing）and broke     10     to form its own government.

At 3:42 a.m. everything began to shake. It seemed as if the world was at an end! Eleven kilometres     1    (direct) below the city, the    2    (great) earthquake of the 20th century had begun. It was felt in Beijing,     3    is more than two hundred kilometres away. One-third of the nation felt it. A huge crack that was eight kilometres long and thirty metres wide cut       4       houses, roads and canals. Steam burst from holes   in the ground. Hard hills of rock became rivers of dirt. In fifteen terrible seconds a large city       5     (lie) in ruins. The       6     (suffer) of the people was extreme. Two-thirds of       7     (they) died   or were injured during the earthquake. Thousands of families were killed and many   children were         8     (leave) without parents.

    9     number of people who were killed or injured reached more than 400,000. Then, later that afternoon, another big quake shook Tangshan. More buildings fell down. Water, food, and electricity were hard     10    (get). People began to wonder how long the disaster would last.