Last night, I was alone on the road, but when I     1     (drive) up to the light, it turned red, and I braked to a stop. Surprisingly, there was not a car, even no suggestion of headlights. But there I sat, waiting for the light to change. I was the only human being for at least a mile in any direction.

I started wondering why I refused to run the light. I was not afraid of     2     (catch) by the police, because there was obviously no policeman anywhere around and there certainly would have been no danger in going through it. Much later that night, the same question of why I had stop for that light came back to me. It isn't only the law, but an agreement we have, and we trust each other to honor it: we don't go through red lights. Like most of us, I'm more ready     3     (stop) from doing something bad by the social agreement that disapproves of it than by any law against it.

Technology is constantly advancing.     1     we imagined it years ago cannot keep up with its pace of development. In the past, autonomous vehicles were just a part of movies,     2     these technologies are now successfully coming into being. An autonomous car, also     3    (know) as a self-driving car, can perform all functions related to everyday driving and parking. It is a technology that senses the environment and, upon entering the destination,     4    (find) its way without human intervention.

Steam engines were used to pull the carriages and it must have been     1    (fair) unpleasant for the passengers, with all the smoke and noise. However, the railway quickly proved to be a great success and within six months, more than 25,000 people were using it every day. Later engineers managed to construct railways in a system of deep tunnels,     2     became known as the tube. The Central London Railway, one of the most successful of these new lines,     3    (open) in 1990.

From Edmonton, the train headed southeast across the great Canadian Prairie. At school, Daiyu and Liu Qian     1     (learn) that Canada’s population is only slightly over thirty-seven million. However, they did not anticipate     2     (see) such an open country, and were truly     3     (amaze). They went through two wheat-growing provinces,     4     they saw a bunch of farms that covered a very large area.

Amsterdam has become very popular with cyclists because of the convenience for bicycles. In the 1960s, a group of cycling fans came up with an idea     1    (make) Amsterdam the city of bikes. People had hundreds of bicycles     2    (paint) white and anyone was allowed to take them. They were hopeful that this would save energy, reduce pollution and provide free public transport. However, thieves stole them all. In 1999, the “white bikes” returned with a computer     3    (track) system to record their every move. It worked this time. Nowadays people can enjoy clean air and easy transport in central Amsterdam and bike-sharing is gaining favors across the globe. In China, many people are devoting     4    (them) to solving problems so that people can enjoy the benefits of shared-bikes.

Some bullet trains don’t run on tracks at all. They fly over them. They     1    (call) maglev bullet trains(磁悬浮高速列车)，and they use two groups of magnets to move. One group pushes the trains up and off the tracks and the other group pushes the trains forward,     2    makes the trains go much faster and make less noise, too. The world’s     3    (fast) train now is a maglev train in China. It has a maximum speed of 600 kilometers per hour.

Once a small county in mountains and little-known to the rest of China, Chongli in Hebei Province, where most of the snow sports     1     (hold) in 2022, is already benefiting from the Olympic Games.     2     (link) to Beijing by a high-speed railway line that began operating in December, 2019, Chongli     3     (become) one of the country's hottest skiing destinations now. The railway has reduced the travel time     4     the capital and mountain resorts from more than 3 hours by car to about 50 minutes by train.