Holding fist is a form of ceremony originating from Chinese martial arts (武术). Traditionally, it is practiced by standing upright,     1     the body straight, holding the right fist tightly, straightening your left hand     2     (have) four fingers in a flat surface, wrapping the left four fingers together around the right fist and placing the two hands in front of your chest, without bringing the     3     (arm) up.

There are two traditional explanations for     4     practice. The left hand with its four fingers represents the four elements: virtue, wisdom, health, and art, all of     5     symbolize the spirit of martial arts. The left thumb (拇指) is slightly bent to imply that one should never be self-centered. Since the right hand is closed in a fist, it symbolizes attack; while the left hand, being virtuous and disciplined, stops the attack and symbolizes self-discipline and     6     (restrict).

The left hand symbolizes the five major lakes of China and the fist represents the four seas     7     (surround) the country. The two hands together show the unity of martial artists. This is exemplified in the saying “The people of the five lakes and four seas are all brothers”.

The holding fist can     8     (see) at every major Chinese event or festival, such as the Spring Festival. On festive occasions like weddings or birthday parties, guests can hold fist to express     9     (they) congratulations to the hosts. At farewell parties, people often hold fist while saying "Take care!" to one another.     10     (occasion), we hold fist to request forgiveness.

“All suspects reportedly     1     (involve) in the killing of a middle school student by classmates in Feixiang district of Handan, Hebei province, have been arrested”, according to a statement by local authorities on Sunday night.

The Beijing News reported that over the past months, this case of the 13-year-old boy, inhumanly killed by his three classmates,     2     (cause) anger and furious debate on juvenile crime.

The victim and his classmates are “left-behind children”,     3     term used to describe kids in China who live with their grandparents in rural areas     4     their parents work in the cities. The victim went missing in the afternoon of 10 March. The local government said the boy likely died on the same day. “He had been bullied by his three classmates for a long time”, said the family’s lawyer, Zang Fanqing, in a Weibo post on Monday. Under questioning by authorities, the three led police to the boy’s body, after     5     (initial) denying that they knew     6     it was buried.

The case has triggered an outpouring of grief on social media, with     7     (ten) of thousands of posts on Weibo and Douyin over the weekend. “The whole country is watching this case. I hope the police can be fair and give the     8     (victim) family a satisfying answer and that the suspects must be punished     9     their young age,” one user said in a comment, which got 50,000 likes. Many in the comments also demanded that the suspects     10     (punish) harshly. Police are still investigating the motive for the killing.

A new study suggests Jupiter’s icy moon (卫星) Europa produces much less oxygen than previously thought. The study was based on the data     1     (collect) by NASA’s Juno spacecraft.

The study involved Juno’s instruments measuring levels of oxygen     2     hydrogen molecules (分子) coming from Europa’s atmosphere. The data showed the icy moon produces about 1,000 tons of oxygen every 24 hours. NASA said that would be enough amount     3     (keep) a million humans breathing for a day.

However, the space agency noted those estimates of oxygen were much less than those measured in earlier studies about the moon. Europa is a little     4     (small) than the Earth’s moon. But it is still one of the largest moons in     5     (we) solar system. NASA observations have suggested     6     ocean exists beneath the thick layer of ice on Europa’s surface. Scientists estimate the moon’s ocean may contain a large amount of water,     7     is twice as the Earth’s oceans.

Since Europa was believed to have a large ocean under its surface,     8     (researcher) in the past identified it as a good candidate to hold the right conditions to support some form of life. That data came     9     (main) from telescope observations of oxygen levels existing in the moon’s icy surface. The new lower estimates of oxygen do not support the earlier observations. The team involved in the study said, in the future, more research     10     (need) to confirm the latest findings.

The vast fields of wheat in Northeast China are no ordinary plants — they were created in outer space. They are a variety known as Luyuan502 and are China’s second most     1     (wide) grown type of wheat. The plants were bred from seeds     2     (fly) into orbit 340 km above the Earth’s surface. In the unique low gravity environment, they picked up subtle (微妙的) changes to DNA that gave them new qualities,    3     made them more tolerant to drought and able to better resist certain diseases.

They are an example of a growing number     4     important food crops that are being bred on spacecraft and space stations while orbiting our planet.     5     some of the mutations (突变) leave the plants unable to grow, others can be advantageous. Some plants become     6     (strong) than previous ones. Besides, they are able to resist more extreme growing conditions, but others produce more foods from a single plant or grow faster or require less water.

China     7     (experiment) with space mutagenesis since 1987. Since then it has conducted dozens of missions     8     (carry) crop seeds into orbit. “We benefit from China’s strong space programme,” says one of the     9     (expert) in China’s space mutagenesis project. “We can use recoverable satellites, high-altitude platforms and manned spacecraft to send our seeds to space up to     10     (two) a year and use those space utilities for crop improvement.”

    1     (construct) from the 5th century BC, the Grand Canal was a means of communication for the Empire for the first time in the Sui Dynasty.

Before foundation of Sui Dynasty, China had     2     (continuous) evacuated several canals,     3     had been suspended due to natural environment. Some needed to be repaired but were still navigable, but were too separated from each other to form large-scale water transport nationwide.

The establishment of Sui Dynasty     4     (declare) the end of long-lasting split situation. In 605 AD, Emperor Yang Guang, the     5     (two) emperor of Sui Dynasty, ordered excavation of the Grand Canal to meet the political,     6     (economy) and military needs of unified nation.

The Grand Canal reached a new peak in the Yuan Dynasty (13th century), providing a unified inland navigation network consisting     7     more than 2,000 km of artificial waterways, linking five of the most important river basins in China,     8     (include) the Yellow River and the Yangtze.

As     9     major means of internal communication today, it has played an important role in ensuring the prosperity and     10     (stable) of China over the ages.