It took years     1    (complete) the Qinghai-Tibet Railway. The construction workers     2    (overcome) the most difficult engineering challenges，one of which was how to protect the delicate ecosystem.To allow the wild animals to move safely and freely in their     3    (nature) habitat，they built thirty-three passages under the railway. To prevent damage to wetlands and grasslands，675 bridges with a total length of about 160 kilometres     4    (build) between Golmud and Lhasa. They even moved 140，000 square metres of wetland to     5     new area in order to protect its distinct ecosystem.     6    (locate) at over 5，000 metres above sea level，Tanggula Station is the highest railway station in the world. In locations such as this，the thin air，changeable weather and high levels of UV radiation presented perhaps the     7     (great) challenge for railway workers. To make sure they stayed healthy，several oxygen-making stations were constructed. To protect Cuona Lake     8     construction waste，the railway workers used thousands     9     thousands of sandbags to build a twenty-kilometre wall along the lake. In a word，the railway workers built our “impossible” railway with the care that the environment deserves. It     10    (true) is an extraordinary “Sky Railway”.

I was one of the people     1     came from all parts of China to work on the Qinghai-Tibet Railway. It is a record of all of our efforts     2     (complete) the most difficult engineering challenges. How to protect the delicate ecosystem was among the top concerns. The Qingshuihe Bridge is the world’s longest bridge     3     (build) over permafrost. To prevent damage to wetlands and grasslands, 675 bridges with a total     4     (long) of about 160 kilometres were built between Golmud and Lhasa. We even moved 140,000 square metres of wetland to     5     new area in order to protect its distinct ecosystem. Located at over 5,000 metres above sea level, Tanggula Station is the     6     (high) railway station in the world. To make sure we railway workers stayed healthy, several oxygen-making stations     7     (construct). We were also able to enjoy regular breaks in lower areas. Using thousands and thousands of sandbags, we built a twenty-kilometre wall along Cuona Lake to protect it     8     construction waste. The Qinghai-Tibet Plateau     9     (attract) people’s admiration for centuries. Now, thanks to our efforts, passengers from all over the country have been enjoying these magical landscapes. It     10     (true) is an extraordinary “Sky Railway”.

Good morning, ladies and gentlemen. This is the station manager     1     (speak). I am sorry to announce that because of the heavy snow there will be a few     2     (change) to the schedule, so please listen     3     (careful) for details of your train.

First of all, please check the ticket to London from Liverpool at 10:50 am at A9, not A17.

Our second     4     (announce) is for passengers travelling to Bristol. The train to Bristol will not leave until 12:20 pm, not 11:40 am. We really do apologize     5     the delay. If you need     6     (far) information, please check     7     (we) website for details.

There is also a message to     8     Mr. Green who is travelling to Glasgow. Would you please come to the Lost Luggage Office,     9     somebody has handed in your computer? I repeat, Mr. Green, your computer     10     (wait) for you.

Nowadays，people often get     1     (stick) in traffic jams. In the last ten years, the number of cars on the roads in Britain     2     (rise) by 30% . Some types of cancer are related to traffic pollution and traffic is one of the major     3     (cause) of global warming and climate change. The average global temperature is about 0. 5 degrees centigrade     4     (high) than it was 100 years ago. We know that cars are bad for us, but we carry on     5     (use) our cars so much because we are addicted     6     them. Jenny Trowe of Greenpeace gives us some advice. First, use our legs. Regular exercise cuts the risk of heart disease by 50%! Second, use public transport. On average, about forty people travel in one bus,    7     the same number occupy thirty-three cars. Third, sharing cars     8     (be) much cheaper and kinder to the environment. In     9     word, we can do whichever of these things     10     suit us. Don’t just sit around and complain!

Traffic jams (堵塞) are a common problem in larger cities. In some cities, traffic jams get so bad during rush hour that it is sometimes       1     (fast) to walk than to drive. Traffic accidents are also a problem. Sadly these problems are not easy to solve. However, a traffic system (系统) being tested in several cities in Northern Europe has led to some surprising     2     (result).

The system     3     (call) “shared streets”. It is a system that has very few traffic laws. As a result, shared street areas have no traffic lights or street signs. Although most people would expect this to cause the number of traffic jams and accidents     4     (go) up, until now     5     has been a great drop in both. One reason     6     (be) that the shared streets system encourages people to be more     7     (care). Without traffic rules, people slow down and pay more attention       8     each other. Normal traffic systems, on the other hand, depend on signs,     9     people often miss or don't follow, leading to accidents. Also, the shared streets system decreases (减少) traffic jams because without fixed (固定的) parking spaces, it is easier for cars to move around       10     (free) when there is a lot of traffic.