Since     1     first fully artificial plastic was invented in 1907, humans     2     (find) innumerable uses for the material. It has found     3     (it) way into our tools, our clothes and even our bodies. In a new study in     4     (environment) science and technology, researchers estimate the average American eats more than 50,000 pieces of microplastic particles,     5     (small) than 5 millimeters in length every year and breathes in another 50,000. Although the health     6     (effect) of consuming these tiny bits of plastic are unclear, researchers stress the real volume that people are     7     (casual) swallowing is alarming. The largest contributor came     8     drinking bottled water, in     9     the bottle itself added more than 32 times more plastic to a diet     10     (compare) with tap water, The Guardian reports.

2 . China’s first overpass for wildlife migration has already come into use. The bridge     1    (lie) over the newly constructed National Highway 214 is able to link animal habitats separated by the road.     2    (cover) with sand―much like the surrounding land, the overpass can fit in with the environment well.

It’s about two years since the national highway     3     (begin) and it is designed with environmental protection as a top priority. A project environmental engineer for the highway said they based the construction of these man-made corridors（通道）    4     years of observation of wildlife migration in the region. The bridge, for example, is built according to the region’s natural conditions and with     5     purpose of reducing the highway’s effect on the animals significantly. Wildlife overpasses and underpasses assist animals     6     (safe) crossing over or under busy roadways and allow them to continue to use their customary paths,     7     would otherwise be blocked.

Those passageways, with a total     8     (long) of 59 kilometers, enable antelopes and other animals to cross the railway freely. So far, China has put great effort into achieving     9     (harmony) coexistence between human development and the protection of wildlife. The Qinghai-Tibet Railway, the world’s     10     (high) railroad, has 33 underpasses for migrating animals.

Windsor Castle is surrounded by a lot of green gardens in the English countryside. It looks out onto the River Thames and sits next     1     a hunting ground. It was built just outside of London     2     (protect) the capital from the enemies on the west side.

Windsor Castle is the oldest and largest castle     3     (occupy) in the world. The castle has a long, rich and troubled history.     4     the castle walls could talk, they’d have many stories to tell.

Kings were born and     5     (die) here. It’s been used as the home of kings and queens for centuries. However, it was also used as a prison during the English Civil War II, the royal family     6    (secret) slept at Windsor Castle because it was safer than London’s urban areas.

Today, Windsor Castle is the private home of Queen Elizabeth II. When she doesn’t meet guests at Buckingham Palace, she goes to Windsor Castle.     7     that’s not all. Windsor Castle is open to the public. It is now one of England's most popular tourist     8     (attract). Visitors can look at some of the finest artworks,     9     (include) the paintings of Rembrandt as well as the well-kept gardens. Is there a better way to learn about England     10     to enjoy some of the country’s finest scenery?

Water is essential to life. However, 785 million people in the world (1 in 9) lack access to it. According to a report by the World Economic Forum (论坛), the water crisis    1    (be) the global risk in terms of impact on society.

We are working every day    2    (change) this situation. We’re here to bring safe water and sanitation (卫生设备) to all. By offering people this fundamental human need, we’re helping provide families    3    hope, health and the opportunity to break the cycle of poverty.

More than six times the population of the United States lives without a household water connection. These people,    4    (particular) women and children, must spend much time in getting water, instead of working, going to school or caring for    5    (they) families.

Access to safe water,    6    has the power to help people save time    7    ( waste) in fetching water when it’s close and not hours away, can protect and save lives. Access to safe water can turn problems into potential: unlocking education, economic prosperity (繁荣)     8    health.

Human    9    (being) deserve to define their own future, and water makes that possible. We've transformed more than 25 million lives with access to safe water and sanitation, and we can reach even    10    (many) people.

Save the Earth

Without the Earth we have nowhere to live, along with many other organisms. If we don’t save the Earth     1    (active) now, our children or grandchildren might not be able to see it for long. Our atmosphere       2     (weaken) and we have to do something about it quickly.

We could plant more     3     (tree) to create more oxygen to keep the bad air away from the atmosphere,    4     we could just stop cutting down the rainforest. We are living and we need the space but we aren’t the only species on this earth.    5     (save) the rainforest is not only good for the atmosphere but also good for the many different species that the earth provides for     6     (we).

We could try to get as many people as possible to switch to other energy using     7     (little) mineral fuels for energy and relying more on solar and wind energy     8     fossil fuels are destroying our earth and we need     9     (limit) the use of it.

Recycling is one of the simplest ways     10     helps our precious planet. Everyone can help. All they have to do is follow three simple rules: Reduce, Reuse, Recycle!

The world is precious and we need to keep it that way.

Despite many laws and national parks to protect tigers, their habitats continue to be destroyed and they are still hunted.    1    (sad), tigers are among the most endangered species in the world nowadays. Altogether, there are no more than 5,000 tigers     2     (leave) in the wild. Some think that the tiger is already to the point of    3    (die) out in the wild. There are many reasons     4       this, like habitat loss and hunting.

Over the years, a number of steps     5     (take) to help preserve the tiger population. The Wildlife Conservation Society ( WCS) protects wildlife and habitats. Today WCS is carrying out work in 53 nations across the world, protecting     6    great variety of species from butterflies to tigers. In 2010, WCS started Tigers Forever,     7     aim was to increase the number of tigers in the world by 50 percent in the next 10 years. To achieve their goals,they are working together with governments and other    8    (organize) which are willing to take strong and effective measures to protect tigers and other wild species

Right now the tiger population     9    (increase) under this program in India and in Far East Russia. Thanks to the hard work of WCS, these large cats have a chance of survival in their     10     (nature) environments and not just in zoos years.

We all know how good nature can make us feel. The sound of the ocean, the smell of a forest and the way sunlight dances through     1     (leaf) help us to relax and think more clearly. The idea     2     humans own a deep biological need to connect with nature has been called "Biophilia",     3     (mean) "love of life and the living world". Yet, according to the United Nations Population Division, so far the number of us going to urban areas     4     (grow) sharply. By 2050, it is estimated that a shocking sixty-eight percent of the world's inhabitants will live in cities. Cities are wonderful places — full of     5     (excite), innovation and energy.    6     living in a city can be stressful. And the more we live in them,     7     more stress we have, leading to increases in mental illnesses     8     depression and loneliness. The good news is that the global science community continues to explain the medical benefits of nature on the brain. Through conducting research and sharing information with different organizations, new ideas are being carried out that encourage us     9     (step) out of the fast street and reconnect with nature in a     10     (rapid) changing world.

Some misunderstanding is putting shark populations at risk now. Thousands of sharks are dying as     1     result of people’s false beliefs.

Female sharks need males to make babies. Some female sharks have the ability to produce a baby by themselves and have young sharks     2     a male shark. That’s something     3    (common) seen in plants and insects like ants and bees.

Shark fins have medical function. Traditionally, shark fin soup     4    (believe) to have health benefits and is quite special in China.     5     modern scientists point out that shark tissue(组织) can be extremely high in poison. What’s more, shark fishing kills up to 100 million animals each year,     6    (endanger) several different species.

If you’re bitten by a shark, you will be a goner. You are more than twice as likely     7    (die) from a lightning strike as from a shark bite, according to the Florida Museum’s International Shark Attack File (ISAF). “Even if you are bitten, the large     8    (major) of people survive”, says Dr. Chapman. There     9    (be) sixty-six unprovoked(无端的) shark bite incidents around the world in 2018, only six of     10     were dangerous, according to the ISAF.

An Italian town will pay people hundreds of euros(欧元) per year if they cycle to work instead of    1    (drive) their cars. The government will pay    2    (cycle)25 cents per kilometre, up to a monthly limit of 50 euros. That means commuters(通勤者)who switch to two wheels could pocket up to 600 euros in a year. It is said to be the first such plan in Italy.

Fifty workers will be included in a 12-month trial, which will use a smart phone app to record the    3    (distant) travelled each day. The plan is being supported from fines    4    (collect) from traffic tickets in the town,    5    by law have to be spent on road safety.

The plan will encourage citizens    6    (make)sure the area becomes more liveable. It will     7    (natural )mean less traffic on the streets and more health benefits. A bicycle organization which helped to develop the idea, says it hopes that other towns will now follow the lead.

A similar plan    8    (introduce)in France in 2014, with mixed results. A six-month trial found that paying people to cycle to work did increase the numbers doing so, but the    9    (major) had been using public transport, rather than private vehicles.    10    those making the move from cars to bicycles, most had already been carpooling (拼车). Private cars remained crowded in the Streets

Sudan is the only male northern white rhino (犀牛) left in the world. That     1     (mean) Sudan, 42, is the last hope for avoiding extinction.     2     (protect) him, officials have placed him under 24-hour armed guard at the OI Pejeta Conservancy in central Kenya. Sudan lives there     3     two female northern white rhinos, Fatu and Najin.

Northern white rhinos,     4     can weigh up to 5,000 pounds, were once plentiful across northern and central Africa.     5     (hunter) have killed thousands of rhinos because of     6     high demand for the animals，horns (角). Rhino horns, believed to have medical effects, are used in     7     (tradition) Asian medicines. More than 1,000 rhinos     8     (kill) in 2014 in South Africa alone and fifty-four rhinos in Kenya, which has a much     9     (small) population.

Sudan, Fatu, and Najin have had their horns     10     (remove) so that they will not be hunted. People hope Sudan and one of the females will be able to have a baby. Sudan is very old, but scientists will not give up hope.