Yesterday afternoon, a boy was swimming in the river when there was something wrong     1     his right leg. He couldn't swim. Then, he     2     (begin) to shout for help. At that time, an old man was     3     (walk) along the river. As soon as he heard the boy's cry, he dived into the river and saved the boy. He put the boy on the bank and more and more people came     4     (see) what had happened.

Ten minutes later, the boy woke up. Then, he ran off down the road immediately, without     5     (say) “Thank you!” All the people there felt     6     (surprise) that the boy didn't thank the old man. The old man,     7     was about 60 years old, said, “I don't think the boy should thank me and give us     8     (he) name. He wants to swim in the river. That is his business. And I want to help him. That is mine. I won't tell you my name,     9     .” Then, he walked away with     10     smile.

My father and I haven’t met for more than two months. It is due to the horrible novel coronavirus epidemic (传染病)     1     we can see each other only through phone video calls. My father is a warrior     2     (dress) in white in the war without smoke     3     the virus although he is not a soldier. My father told me that the ward is     4     (he) battlefield, saying that he is duty bound to fight the virus and protect as many patients as possible. Today, I saw he     5    (wear) a blue medical cap and a pair of transparent     6    (protect) glasses over his own glasses. The eyes were full of love, tears,     7    (strong), power and courage. I know he is in a     8    (danger) situation, but his eyes seem to say, “I’m fine.” He is a real hero,     9     will live in our hearts forever. May God bless all the courageous doctors and nurses     10    (fight) on the front line.

The 15 wild Asian elephants left their habitat in Xishuangbanna National Nature Reserve in Southwest China's Yunnan province and     1    (move) to the north. 41 days later, the herd traveled to Hongta district, Yuxi city neighboring with the south of Kunming. The     2    (locate) was only 20 km away from Kunming's Jingning district and less than 100 km away from the capital s downtown area. The herd,     3    (original) consisting of 17 elephants in total at their departure time,     4    (report) to leave Xishuangbanna last year.     5     May 24th, a young elephant found alcoholic food at a villager's home and got drunk. Luckily, the baby elephant,     6     overslept, rejoined the unit the next day. The 15 elephants continued their journey. The Asian elephant,     7    (include) on the International Union for Conservation of Nature Red List of Threatened Species as endangered, enjoys Class-A protection in China, the same level as that of the giant panda. Yunnan     8    (be) the only habitat of wild Asian elephants in China. Before the 1970s, the species was threatened due to many reasons, such as an increase in the human population, reduced forestry areas     9     illegal(非法的) hunting. The number of elephants dropped significantly. However, due to determined protection efforts in recent     10    (decade), the Asian elephant population in China has risen from 170 in the 1970s to 300.

Dr. Nancy Foster was a great marine (海洋) leader,     1     helped lay the groundwork or today’s network of national marine research. After     2    (graduate) from Texas Woman’s University, she received her master’s degree in marine biology and her PhD from university. Dr. Foster     3    (begin) her career at NOAA (美国国家海洋和大气局) in 1977, where she was responsible     4     the Sanctuary and Reserves Program. In     5     mid-1980s, she became chief of the National Marine Fisheries Service’s Office of Protected Resources. Besides, she     6    (actual) tried to take part in     7    (vary) marine programs.

She served as Acting Assistant Administrator from January to October 1993, and worked for the National Ocean Service from 1998 until her surprising     8    (die) in 2000. With her     9    (profession) effort for the environment, NOAA     10    (lead) into a modern coastal resource management and conservation to protect the marine environment.

Karachi,Pakistan,is one of the hottest cities on Earth. In June 2015, more than 1,000 people died there during a heat wave (热浪期). “It was a terrible time,” Shahzad Qureshi said, “we needed     1     (do) something about it.”

Following that heat wave, Qureshi started a group     2     (call) Urban Forest. It plants native trees in cities in Pakistan.

Trees help cool the air by providing shade (荫）and giving out moisture (湿气）through     3     (they) leaves. This is especially     4     (help) in cities where roads and buildings hold in the heat.

For its first project, Urban Forest planted about 1,300 trees in a park in Karachi. The group uses a special method     5     is useful for the growth of the trees. In three years, the trees grew to be 30 feet tall.

Since 2015, Qureshi and his team     6     (plant) 14 urban forests in Pakistan, 12 of which are in Karachi. In addition to     7     (cool) the air ,the trees provide a habitat (栖息地）for birds and insects.

In2017, Qureshi helped plant an urban forest at Karachi Grammar School. He met with students to teach them     8     how trees help the environment. Then the students helped plant trees in the schoolyard. The trees attract     9     number of birds and butterflies.Students to outside during science class to study the forest. “It’s like a library of native trees in front of the kids all the time,” Qureshi says. “It’s a     10     (true) beautiful thing to see.

Many students     1     (study) English for years.However, some students still have difficulty in     2     (speak)fluent English.Some know many     3     (word), but are unable to understand them when native speakers use them.In our oral English classes we will focus on (专注)speaking and listening     4     native English speakers.So we will have a rule that ONLY ENGLISH     5    （speak）in our English classes.Anyone speaking Chinese in class will be commanded     6     (pay) a fine (罚款) in order to encourage the speaking and understanding of English.If teachers enter a classroom and discover     7     anyone is speaking Chinese, they will command everyone in the room to pay     8     fine. It is everyone’s job to obey the English-only rule.It is for     9     (you) benefit. It is     10     we want to accustom (使习惯于) your ears to hearing English.

Green Hills, Clear Water, Blue Sky is a project that was set up by the government three years ago. Since it was started, many people    1     (take) part. They think it is     2     (they) duty to make the Earth    3     (beauty) and peaceful. At    4     same time, they insist that the government should play an important role and try their best    5     (protect) the environment. Some answers of factories are damaging the environment by     6     (pollute) rivers with chemical waste. So it is     7     (believe) that the government should pass laws to punish people    8     damage the environment. Besides, the government should build conservation centres so that plants and animals     9     danger can be protected.

All in all, people and the government should work side by side to take care    10     the Earth.

In 1899, when Einstein studied at the Swiss Federal Institute of Technology in Zurich, his tutor(导师) was Minkevsky, a mathematician(数学家).

Once Einstein asked Minkevsky, “How can     1     person, like me, leave his footprints on the road of life and make an outstanding contribution in the     2     (science) field?” It was a complex question. Minkevsky said he had to think about it carefully before     3     (give) him an answer.

Three days later, Minkevsky told Einstein the answer was coming! He took Einstein towards a building site and there they set foot on the ground newly covered by cement (水泥) ,     4     of course, led to the workers blaming them. Einstein was     5     (confuse), so he asked Minkevsky,“Sir, haven’t you led me the wrong way?”

“Can’t you see?” Minkevsky said. “On the old road surface that has long solidified（凝固） and in those places which     6     (pass) through by countless steps, you cannot leave your footprints.”

Hearing that, Einstein thought long and nodded     7     (serious). From then on, his creativity was inspired. He said, “I never memorize and consider     8     dictionaries and manuals (手册) contain, for my brain only memorizes those things not     9     (include) in books.” It was in this way     10     Einstein left his deep footprints in the history of science.

Crosstalk, Xiangsheng in Chinese, is a     1    (tradition) Chinese comedic performing art and one of China's most popular cultural forms. It's     2    (general) believed that crosstalk developed sometime in the Qing Dynasty. After the People's Republic of China     3    (found) in 1949, this art became increasingly popular. Today, it is     4    important part in the CCTV Spring Festival Gala and other countless shows in China.

There are four     5    (skill) in crosstalk: speaking, imitating, teasing and singing. Most of the time, it is performed by two actors-one serves as the leading actor while the other plays a supporting role. However, sometimes it is performed as a monologue (独白)，    6    is completed by one person mainly telling jokes, and at other times it is performed by more than two actors,     7     (call) group performance. Crosstalk is humorous and its language is lively and rich     8    puns (双关语).

Jump into a taxi in Beijing, and chances are that your driver will be listening to a radio broadcast of a crosstalk show. These days, more and more foreigners are becoming interested in     9     (study) the art of crosstalk. Crosstalk is a huge part of Chinese culture and it appears as if it's getting even     10    (big).

The Medal of the Republic, the Friendship Medal and other national honorary titles have gone to 42 outstanding individuals     1     background are varied for their contributions to the People’s Republic of China (PRC) to celebrate the 70th anniversary of its founding.

Pharmaceutical chemist Tu Youyou was one of the eight who     2    (award) the Medal of the Republic. She was the co-winner of the 2015 Nobel Prize in Physiology or Medicine. Yuan Longping, a Chinese agronomist (农学家) and     3    (educate), was another of the eight. Yuan is well-known for developing the first hybrid rice verities. His breakthrough led to     4    (grow) hybrid rice in Africa, South America and Asia, which could provide a     5    (rely) food supply for high-risk famine (饥荒) regions.

The six foreigners     6    (present) with the Friendship Medal included Raul Castro, first secretary of the Central Committee of the Communist Party of Cuba, and Princess Maha Chakri Sirindhorn of Thailand. Canadian Isabel Crook was also     7    them. 104-year-old Crook who was born in China has been     8    witness to China’s development. After the founding of PRC, she insisted     9    (firm) on staying in China and working at Beijing Foreign Studies University (BFSU). As a teacher at BFSU, she     10    (lay) foundations for foreign-language education in China.