I was one of the people     1     work on Qinghai-Tibet Railway, which was completed by overcoming the most difficult engineering challenges to protect the delicate ecosystem.     2    (allow) animals to move safely and freely, thirty-three     3    (passage) have been built. To prevent damage to wetlands and grasslands, 675 bridges, which is about 160 kilometers in     4    (long), were built and 140,000 square meters of wetlands     5    (move) to protect its distinct ecosystem. Tanggula Station, which     6    (locate) at over 5,000 meters above sea level, is the highest railway station in the world. To keep us     7    (health), several oxygen-making stations were constructed. To protect Cuona Lake     8     construction waste, a twenty-kilometre wall was built. Thanks to     9     efforts, passengers, who have been attracted by the Qinghai-Tibet Plateau, have been enjoying these     10    (impress) landscape.

China has the world’s largest number of world natural heritage (遗产) sites. The country is now home     1     14 world natural heritage sites and four mixed sites,     2     are famous for both cultural and natural features, both leading the world in terms of quantity, the administration said. These heritage sites     3     (effective) protected China’s representative geological relics, mountains, forests and lakes, along with the rare and     4     (endanger) animal and plant species, the administration said Friday at     5     news meeting about cultural and natural heritage day, which falls on June 8 every year. In the past few years, the country     6     (increase) legal, and technological support of the protection of its world natural heritage, establishing a     7     (manage) system with Chinese characteristics. China’s world heritage has contributed to the country’ economic development     8     presented its image to the world. These areas have also played an important role in the protection of cultural relics, intangible cultural heritage and historic cities, towns and villages,     9     (bring) in over 14 billion yuan in average annual tourism income for     10     (local).

A new United Nations climate report predicts Africa’s rare glaciers     1     ( disappear ) in the next 20 years.     2     report, called State of the Climate in Africa,     3     ( release ) last Tuesday by the UN’s World Meteorological Organization ( WMO ) and other agencies.

The report warns that the melting glaciers at Mount Kilimanjaro in Tanzania, Kenya’s Mount Kenya and the Rwenzori Mountains in Uganda     4     ( be ) signs of widespread climate change to come. Data shows     5     ( temperature ) on the continent were 0.86 degrees Celsius     6     ( high ) than the average in the 30 years leading up to 2010.

Petteri Talas, Secretary-General of the WMO, said “ Massive displacement, hunger and increasing climate events such     7     droughts and flooding are likely     8     ( continue ). ”

It also came as African countries are demanding a new system to follow financing from     9     ( wealth ) nations that are failing to meet a $100 billion yearly target to help the developing world fight climate change. The demand shows the tensions     10     exist over climate change policies between the world’s 20 largest economies and developing nations.

With the     1    (develop) of industry, air pollution is getting more and more serious. In Beijing, many people suffer different kinds of illnesses because    2     air pollution.

Air pollution is caused by the     3    (follow) reasons : about half of the problem is caused by vehicles. There are more and more cars, buses on the roads, and they   give off     4    (poison )   gases. 25% of air pollution is caused by factories. Another factor is the smokers. Smoking not only does harm to their health,     5     to others. Besides these, about 10% of air pollution is caused by other reasons.

We should take some    6     (measure) to fight against pollution. New fuel can be used to take     7     place of gas. We can plant     8     (many) trees than before.     9     everybody realizes the importance of environment and does something to stop pollution, the problem will     10    (solve).

Strange things appeared before the Tangshan earthquake happened. For three days the water in the village wells     1    (rise) and fell. The well walls had deep cracks in them. A smelly gas came out of the cracks. Some animals including fish,     2    (mouse) behaved strangely. Other strange things also happened in the city,     3     people thought little of these events and they slept as usual.

    4     (final) a terrible earthquake hit the city of Tangshan on July 28, 1976, in which more than 240,000 people died and many     5    (injure). Many houses fell down and sand filled the wells instead of water. People were greatly shocked. All the electricity in the city was cut off and people began     6     (wonder) how long the disaster would last. The whole city was completely destroyed and the world seemed to be     7    an end. It was one of the most destructive earthquakes ever,     8     shocked the whole nation.

However, the people of Tangshan didn’t lose hope because 150,000 soldiers were sent to help the rescue workers. The soldiers tried their best to dig out those     9     were trapped. They also built shelters for the     10     (survive). Fresh water was taken to the city by every means. Slowly, the city began to come back to life.

10 . Are you facing a situation that looks impossible to fix?

In 1969,the pollution was terrible along the Cuyahoga River Cleveland, Ohio. It    1    (be) unimaginable that it could ever be cleaned up. The river was so polluted that it    2    (actual) caught fire and burned. Now, years later, this river is one of    3    most outstanding（杰出的）examples of environmental cleanup.

But the river wasn’t changed in a few days    4    even a few months. It took years of work     5    (reduce) the industrial pollution and clean the water. Finally, that hard work paid off and now the water in the river is    6    (clean) than ever.

Maybe you are facing an impossible situation. Maybe you have a habit    7    is driving your family crazy. Possibly you drink too much or don’t know how to control your credit card use. When you face such an impossible situation, don’t you want a quick fix and something to change immediately?

While there are    8    (amaze) stories of instant transformation, for most of us the    9    (change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be     10    (patience).