1     ( sit ) back in my seat, I can’t believe that I’m about to travel along the railway that many foreign experts claimed was “impossible”. The train has been racing along     2     ( steady ) since it left Xining.

I was one of the people     3     came from all parts of China to work on this railway. Taking years to complete the Qinghai - Tibet Railway is a record of all of our efforts to overcome     4     most difficult challenges. How     5     ( protect ) the ecosystem was among the top concerns . The first landmark     6     ( catch ) my eye is the Qingshuihe Bridge, the world’s longest bridge built over permafrost. To prevent damage to wetlands and grasslands, 675 bridges     7     ( build ) between Golmud and Lhasa.

Tanggula Station,     8     ( locate ) at over 5,000 metres above sea level, is the highest railway station in the world. To make sure we stayed healthy, several oxygen - making stations were constructed. Passing Cuona Lake, I feel a sense of pride and     9     ( achieve ). Along the lake we built a twenty - kilometre wall to protect the lake     10     construction waste.

I’m proud that we built our “impossible” railway. It truly is an extraordinary “Sky Railway”.

2 . Imagine sitting inside a windowless train that's shooting through a tube at twice the speed of an airplane. Your train has no wheels, produces no _________ , makes its own electricity, and isn't affected by bad weather. This is the hyperloop, a new vision for the world's _________ , safest, and greenest form of transportation. Many have _________ this new technology, but others say the hyperloop vision is just a bunch of hot air.

Hyperloop developers plan to use the properties of magnets to float, stabilize, and drive the capsules or pods for hundreds of miles through _________ tubes. Without air or ground to slow down the vehicles, what was once a five-hour journey would become a half-hour excursion, engineers promise.

Supporters of the technology promote additional _________ of transporting passengers and cargo by hyperloop. For example, they firmly state that unlike other city-to-city transport that's _________ , such as planes or trains, hyperloop vehicles would leave as needed, like Ubers and taxis. While the _________ would hold only 28 to 50 passengers each, developers plan for them to depart stations in groups every minute or so which they say could amount to shuttling 50,000 people an hour. That's more than twice the passenger _________ of the world's fastest trains.

Developers also say that hyperloop tubes would be _________ so they wouldn't interfere with other traffic or threaten wildlife. And tubes would be covered with solar panels to power the hyperloop's systems. ____________ , advocates regard the hyperloop as the transportation choice for the future.

But not everyone is on board. Engineers have calculated that the high-speed vehicles will need to make much wider turns than currently envisioned, and otherwise they won't be ____________ for passengers. This would add several miles to the proposed tube tracks, Engineers also say planners haven't included enough time for vehicles to safely brake and take off at stations. Some engineers believe it will take much longer than claimed to pump the ____________ out of the tubes before each vehicle's departure. Critics thus say hyperloops can't go as fast or serve as many passengers per hour as advertised, making them ____________ existing high-speed transportation options.

Hyperloop companies say they're ____________ these concerns. They claim that they can safely maintain high speeds by having the vehicles bank around the turns as a plane does. And their hyperloops will rely on the split-second reaction times of a computer to ____________ vehicles quickly, frequently, and safely.

Many people often get     1     (stick) in traffic jams when they go to work. How tired and angry they often feel! But the problem is that     2     number of cars is still increasing. And traffic is one of the major     3     (cause) of global warming and climate change. What's more, some types of cancer are related     4     traffic pollution. We all know that cars are bad for us. But we are still addicted     5     cars. Some advice has been given to help people give up cars. For example, we should use public transport or share cars. As we know, up to ninety people can travel in one bus     6     the same number will need at least eighteen cars. Do your shopping in the shops that are just around the corner instead of     7     (drive) to the other side of the town. Sharing cars is much     8     (cheap) and it is kinder to the environment. Let's     9     (take) action to solve the problem and do     10     (which) of the things that suit us.

The major construction work on the world’s longest cross-sea bridge     1     (complete) on Oct. 24th, 2018, which connects Zhuhai in Guangdong Province with Hong Kong and Macao. A ceremony     2     (hold) in Zhuhai to celebrate its completion soon.

More than 400,000 tonnes of steel     3     (use) for the 6.7 km undersea tunnel and 22.9 km bridge. Therefore, the bridge     4     (name) “one of its seven wonders of the modern world near completion” by a British newspaper.

The travel time from Hong Kong to both Zhuhai and Macao     5     (cut) greatly. History    6     (make) in many aspects by the project. For example, maritime protection was taken seriously as the construction region     7     (overlap) with the reserve of Chinese white dolphins.

It was the first time that an immersed tube tunnel    8     (build) in open waters in China. Besides, it    9     (predict) that the bridge     10     (operate) for 120 years. If it were not for the progress of “Made in China”, the construction couldn’t have been realized in such a short time.

The “China technology” and “China standard” set by the Hong Kong-Zhuhai-Macao Bridge will even influence the world market.