A model of China's future double-decker bullet train (双层动车) was displayed by the Chinese Academy of Sciences on Monday, with experts     1     (say) it could reach very high speeds.

Zhang Weihua,     2     bullet train expert, told Science and Technology Daily that the double-decker bullet train will be able to run at the same top speed as a fast single-deck train. But an important problem     3     needs to be solved is that it may lose stability when turning at     4     (extreme) high speeds. But he believes that once design and technical problems such as the train's high center of gravity and large passenger capacity (容量)     5     (solve), the     6     (safe) will be fine when the train operates at proper speeds. Recently Germany and France     7     (plan) to use double-decker technology in the next generation of high-speed trains     8     the goal of improving passenger capacity and economic effectiveness.

China's double-decker bullet train, which is made     9     (aim) at the international market, will have a base speed of 160 km/h. However, when fitted with core components (核心组件) designed according to the current standards for high-speed trains, it will be capable of much     10     (high) speeds.

Have you had enough trouble spelling English words? You are not alone. Scholars have argued against the irregularities in English spelling since the 17^th century.

Part of the problem    1     (cause) by the various origins of English words. German, Latin, French and Greek are all common     2     (source), and each follows a different set of rules for spelling.

Some English learners know that     3     (memorize) the Latin roots of English words is a great way to enlarge their vocabulary, as many Latin-rooted words entered English from French after the Norman Conquest (诺曼人征服英格兰). The Normans used French    4     the language of the court, throwing Old English out of official usage for around 300 years. By the time English was again allowed at the court, it was a French-influenced language. There was     5     (actual) no set form of spelling. Until the 15^th century the use of the printing press and the mass distribution (大量流通) of books    6     (freeze) the spelling of words. The spelling system we use today is based on the    7     (pronounce) of that time.

Supporters of English spelling reform argue that replacing words with regular spelling rules will make them easier     8     (remember). Others say that the spelling system, on     9     English is based today, leaves plenty of applications to unlocking the history of the language,    10     (help) readers understand the origins of words.

The Chinese New Year red envelope is one of     1    most popular Chinese traditions for children on the Chinese New Year. They are given red envelopes with money inside! Kids     2    (usual) learn the words for the red envelope quickly: “hong bao”     3    (write) in Chinese.

The red color for the Chinese stand for good fortune,       4     is the lucky color. Traditionally the envelopes     5    (decorate) with gold letters and messages of happiness or Chinese lucky     6    (symbol) like the Chinese dragon, the phoenix, etc. Nowadays, in keeping up with the times, you can find anything from Mickey Mouse, Pokémon     7    Hello Kitty on the red envelopes.

Technically, all unmarried kids get red envelopes during the Chinese New Year from Grandmas, Grandpas, uncles, aunts, Mom and Dad of course. It is also common for close friends and neighbors     8    (give) red envelopes to the children during the festival.

Who gives money and how much money is given really depend on the     9    (person) relationship and the age of the kids.

So a common Chinese New Year greeting that waits for any adult     10    (visit) a family with kids will be "Best wishes for the New Year. May I have my red envelope please?"

May Basket Day is a lovely tradition with a long history.    1    (sad), most kids today have never heard of it. If you don’t know what we’re talking about either, here’s the colorful and    2    (attract) history behind this heartwarming custom.

On May Basket Day, people would gather their flowers and arrange them in little baskets    3    candies and treats. Then, They would hang them on the doors of some of their neighbors and    4    (friend).

What’s more. May Basket Day     5    (regard) as a mini-Valentine’s Day in the past because people would often leave the flowers tied to the door of someone    6    they loved. If the receiver caught someone in the act of    7    (hang) a basket on his or her door, he or she would chase the other person and give him or her a kiss.

Kids today might laugh at such    8    idea, but back in the late 19th and early 20th centuries, it was celebrated by many people. In the 1960s, journalists    9    (write) about how few people were still celebrating the day. Now, the tradition is only practiced by small pockets of the country. However, we think that it’s high time    10    (bring) this habit back.

In 1972, UNESCO started a programme to protect the world’s cultural and     1    (nature) heritage. Since then, more than 800 cultural sites     2     (add) to the World Cultural Heritage Site List. The Taj Mahal (泰姬陵) in India and the Imperial Tombs of the Qing and Ming Dynasties in China    3     (be) two of the best known examples.

The Taj Mahal built between 1631 and 1648, is a masterpiece of architecture. It took more than 20, 000 workers and 1,000 elephants    4     (complete) the project, and the stones came from as far away as China.

    5    makes the Qing and Ming Tombs unique is that they bring together architecture and philosophy.     6     (build) by several emperors between 1368 and 1915, the Tombs represent Chinese cultural and historical    7     (value) that have been handed down from generation to generation for thousands of years.

Human life     8     (last) only a short time but art and culture last forever. The programme attempts to protect and preserve     9     best of human history. Masterpieces such as the Taj Mahal and the Imperial Tombs remind us     10    what we can achieve at our finest, and inspire us to live up to our great past in the future.

It is a big challenge    1     (keep) the balance between economic development and the protection of cultural sites. However, Aswan Dam is considered     2     great success, which proves it's possible for countries to work together to build a much     3     (good) tomorrow.

A serious earthquake happened in Tangshan in 1976. Hundreds of thousands of people    1     (injure) or badly killed. Soldiers, doctors and nurses came to save people     2     were trapped under the buildings. Workers    3     (build) shelters for survivors. Slowly, Tangshan started to get back up on     4     (it) feet.

A young Tibetan herdsman,     1    name transliterates as Dingzhen in Mandarin, has become a national heartthrob in China after millions of netizens became    2    (fan) of his “clean eyes and pure smile”.

About two weeks ago, a photographer went to Li tang    3    (take) some pictures, and he accidentally shot a video of Dingzhen. In the video, Dingzhen was captured walking in front of his home and    4     (smile) shyly towards the camera. The photographer posted the video on Douyin, and it soon gained two million likes and more than 100,000 comments. Some netizens commented that “the young man’s eyes are full    5    stars and are as pure    6    the blue sky behind him”.

Dingzhen’s sudden popularity made him get    7    large number of fans on China’s social media platforms. When Dingzhen registered a new account on Douyin on November 19, he gained nearly 2 million followers overnight, and his first video    8    (view) about 14 million times in a day.

However, some net users worried that his sudden hit would make his life disturbed, as many netizens have    9     (eager) dug up all the details they can find about the young man. Some entertainment companies intend to employ him. However, Dingzhen refuses and determines to make a living on    10    (he) own.

Games don't come with built-in rulebooks and uniforms. They develop over time from     1     (activity) that people play for fun. For example, basketball     2     (invent) to help American football players have fun and stay in shape in the cold winter months. Here is the story.

James Naismith had a problem. It was cold and snowy outside the Young Men's Christian Association (YMCA), in the USA,     3     he worked. Athletes on the football team were sitting around getting     4     (bore) and out of shape. Naismith was asked to think up an indoor game     5     (get) them in shape.

What would Naismith do? He went to the storeroom     6     brought up a soccer ball. Then he asked the doorman to find two boxes to fix on the walls at opposite ends of     7     (they) small gym. The doorman     8     (can) not find any boxes, so he brought up two old peach baskets. They worked just fine. The first two points in the first basketball game ever were scored by    9     overweight football player. He received a bounce pass (反弹传球)     10     (perfect) from a friend and did a jump shot with a soccer ball into a peach basket.

The Mid-Autumn Festival or the Moon Festival, the second most important festival in China after the Spring Festival, traditionally     1     (fall) on the 15th day of the eighth month in the Chinese lunar calendar.

In the past, the Moon Festival     2     (observe) at harvest time. Ancient Chinese emperors worshiped (敬奉) the moon in autumn to give thanks     3     the harvest. The ordinary people took the Mid-Autumn Festival to be a     4     (celebrate) of their hard work and harvest. Nowadays, people mainly celebrate the Moon Festival as a time for family reunions. They have long believed that worshiping the moon and eating together around     5     round table will bring them good luck and happiness.

The common customs of the Mid-Autumn Festival include family members eating dinner together,     6     (share) mooncakes, worshiping the moon with gifts and displaying lanterns.

Mooncakes are the must-eat Mid-Autumn food in China. Chinese people see the roundness of mooncakes as a symbol of reunion and happiness. Other foods     7     (eat) during the festival are harvest foods, such as crabs, pumpkins and grapes. People enjoy them when they are in the     8     (fresh) and most nutritious (有营养的) state, and nice meanings are particularly connected with round foods.

Festival food traditions are changing. The younger generation have their own choices about     9     they eat. Many of them don’t like mooncakes very much and choose     10    (enjoy) their favorite foods.