For many parents, making sure that their children get the right amount of sleep can be     1     (stress). This is especially true during high-pressure times such as exams when students study all night for the next day.     2     (unfortunate), it is often counterproductive (适得其反的) because with fewer hours to sleep, the brain doesn’t get enough time to keep     3     they’ve studied the night before.

Poor sleep will have all sorts of negative effects on teenagers,     4     (include) the rise in blood pressure, and impatient behaviors. Without enough sleep, the brain can no longer work     5     (deal) with information properly and use information already     6     (learn).

So, how can parents help? If you think your child needs more sleep, try making gradual adjustments to their sleeping habits. So far, studies     7     (show) improvements in changing sleep patterns. And remember your children are going through     8     period of time in their lives when their brains and bodies are going through a lot of     9     (change). Not only is your job to help make a difference, but it’s also to ride the wave with them. It may not be easy,     10     they will thank you for your help eventually.

Chinese telecom giant Huawei on Wednesday     1     (official) launched its operating system Harmony OS 2 for smartphones,     2     (provide) customers worldwide with a competitive alternative that works on a diverse range     3     devices. Harmony OS, or Hongmeng in Chinese, is     4     open-source operating system     5     (design) for various devices and scenarios. It was first lunched on Internet-of-Things (IoT) devices, including     6     (wearable) and tablets, in August 2019.

“We     7     (surround) by more and more smart devices these days, and are now in a world     8     all things are connected,” said Richard Yu, CEO of Huawei’s Consumer Business Group. “Every single one of us     9     (be) a part of this fully connected world, as is every device.” “We look forward to working with more partners and developers     10     (build) a thriving HarmonyOS ecosystem,” he said.

Suzhou is a cultural and historical city in China’s Jiangsu Province. It is celebrated all over the world for its classical gardens     1    have been added to the list of World Heritage Sites. They were first laid out as far back as the 6th century BC and     2     (reach) their top during the period from the16th century to the 18th century. Records show that there were over 200 gardens during their golden age. The gardens show the importance of natural     3     (beautiful)in Chinese culture.

Today, dozens of classical gardens are still     4    good condition ,including the Humble Administrator’s Garden, which     5     (have) an area of some 52,000 square meters. No other gardens of Suzhou are     6     (large) than it. It was originally the dwelling(住宅) of Lu Guimeng,a poet of the Tang Dynasty.     7     (consider) as “the mother of all gardens under the sun”, the garden     8     (divide) into the eastern, central, western and residential parts. The gardens of Suzhou are     9     (extreme) elegant (漂亮雅致的) and a feast for the senses, used as both tourist attractions    10    residential houses. They also add a human touch to the natural delights(乐趣) of the gardens themselves.

“Father of hybrid rice” Yuan Longping     1       ( pass) away at 13:07 pm in Changsha of Hunan province, Xinhua reported     2    Saturday. Yuan Longping(1930-2021) was a pioneer for all people. Although he was one of China's most famous    3    (science), Yuan Longping considered     4     ( he) a farmer.Indeed,his sunburnt face and arms and his slim,strong body were just like those of millions of Chinese farmers,for whom he had struggled for decades. Dr Yuan Longping developed super hybrid rice. In 1974,he became    5     first agricultural pioneer in the world    6    ( grow) rice with a high output.Now more than 60% of the rice     7    (produce) in China each year is from this hybrid strain.

In 1949, Yuan applied for Southwest Agricultural College and began his special     8     (connect) with rice--a staple food of the Chinese people that would become the focus of his lifelong research career.

Now the focus of Yuan's hybrid rice project    9     ( change) from increasing output to green and sustainable development     10      is strong and tall enough.The second dream is that the whole world can plant the rice he developed and all the people in the world  are not hungry.

Let's remember the great man.

Known as China's national opera. Beijing Opera also     1     (call) Peking Opera, which originated in the late 18th century, is a     2     (combine) of music, dance, art and acrobatics (杂技). It is the most influential and representative of all operas in China. It is called Beijing Opera     3     it is formed in Beijing. Beijing Opera has       4     history of 200 years and its origin can date back to old local operas, especially Anhui Opera,    5     was very popular in northern China in the 18th century. In 1790, the first Anhui Opera performance     6     (hold) in Beijing to celebrate the Emperor's birthday.

Later, some other Anhui Opera troupes (班子)     7     (continue) performing in Beijing. Anhui Opera was easy     8     (move) and good at absorbing the acting styles of other types of operas. Beijing accumulated many local operas, making Anhui Opera improve quickly.

    9     the end of the 19th century and the beginning of the 20th century, after the marriage for 10 years,

Beijing Opera finally formed, and became the     10    (big) of all operas in China.

Elizabeth Blackwell fought for women’s     1     (right). In 1849, she became the first woman ever     2     (receive) a medical degree in the USA. Later, Elizabeth     3     (open) a hospital for poor people in New York City. She continued to work with people     4     needed help until she died in 1910.

Nelson Mandela is one of the     5     (famous) people. He spent 27 years in prison for     6     (fight) for the rights of black South Africans. After he came out of prison, he became South Africa’s first black president and     7     (award) the Nobel Prize in 1993. He retired in 1999 and then traveled around the world, meeting leaders and talking about problems like AIDS.

Jane Goodall has spent     8     (near) forty years studying animals in the national park of Gombe in Tanzania. For many years, she has worked to protect animals and to change people’s opinions     9     the environment.

The Montreal Museum of Fine Arts in Canada has organized a group of doctors to help sick people in the past few months. The doctors will send patients to art galleries, instead of     1    (give) them medicine. The museum is involved in ten experiments on patients to find out how art has an effect     2     health. The patients include people with breast cancer (乳腺癌), eating disorders and mental health     3     (problem). Thomas Bastien, director of education and wellness at the museum, believes that art can heal. He said, “We saw that the museum was good for people, so we     4     (decide) to start this program with the doctors a few months ago. If you have breast cancer, you can come to the museum and you might feel much     5     (well)”.

Dr Helene Boyer,     6     has a lot of experience in helping to heal people with art treatment, spoke about its advantages. She said, “There’s more and more scientific evidence that art treatment is good for your physical health.” She said that looking at art increases     7     same kinds of hormones (激素) in our bodies that     8     (produce) when we exercise. The museum’s director-general said, “I am     9     (complete) sure that in the 21st century, art will be what physical activity was for health in the 20th century. I am very     10     (confidence) in it.”

Countries around the globe are spending billions of dollars and lots of time on various space missions, whether to Mars     1     other planets much further away.

Firstly,     2     (explore) space has already made a difference in the fight against world hunger. A number of the satellites record data on land and weather patterns. As     3     result, space-based science has helped farming in its efforts to grow enough food     4     (feed) Earth's increasing population.

Secondly, space exploration has already promoted technological     5     (improve) that benefit us all. High-end products around the world     6     (make) to a higher standard now because of advanced technology     7     was first created to meet the requirements for space exploration.

Finally, sending astronauts into space has helped people to think about the world's problems and even to find ways     8     (solve) them. Seeing pictures of our planet as an island in a black sea made people realise that our planet's resources are limited. The     9     (great) attention at present is on Mars because it is closer to Earth. In the future, humans may live on both planets.

    10     closing, exploring space provides the world with many different benefits. Therefore, it should continue so as to provide new and better solutions to people's short-term and long-term problems.

Last year, two days before Christmas, my friends called, telling me their kitchen caught fire,     1       (destroy) everything in it. I drove to their house, taking all the food that I had. They were so happy to see me, but felt     2     (embarrass) having nothing to give me in return.

I went home, very upset.     3    (actual), I was also in a hard place financially and unable to do     4    (much) for them. I called a friend of mine about this, who responded, “These people mean a lot to you and I want to help    5    (they) .” Since he had never met them, he requested me     6    (go) to the grocery store, all on him. At the check-out, I noticed him lacking money, so that I had to have some items taken back.

We were walking away    7    I heard a voice behind me asking the clerk, “How much are those things? I decide to pay for them.” I turned around,     8    (thank) the kind man and told him everything. He explained that he understood as he had lost his job the year before but now was working again.    9    tears in our eyes, all of us went away. It was such     10    wonderful feeling to see folks step up when someone needed help, even a total stranger.