In May of 1886, 400,000 workers in many parts of the USA went on strike, demanding an eight-hour working day. The strike started     1    (peaceful), but on the third day of protests in Chicago, there was some violence. The police shot at unarmed workers,    2    (kill) several of them. The next day there were more protests and someone threw a bomb. Seven police officers and four workers were killed by the bomb. The person     3    threw the bomb was never identified, but eight workers were arrested. Seven of them were sentenced to     4    (die), and one of them was sent to prison for 15 years.

This event, known.    5    The Haymarket Affair, was very important in bringing working people together in the USA. Many people didn’t believe the men were     6    (guilt), and the trial was criticized for being unfair. The Haymarket Affair became     7    international symbol of the struggle for workers’ rights, and May    8    (choose) to be International Workers’ Day. On this day, socialist parties and trade unions called for workers     9    (demonstrate) for the eight-hour day and in favour of peaceful protest. The eight-hour working day became law for public workers in 1892. Since then, workers’ movements all over the world     10    (continue) to fight for and win this right.

Dujiangyan Dam, 45km north of Chengdu, an ancient technological wonder of the country, was originally constructed around 256 BC by the State of Qin    1    an irrigation(灌溉) and flood control system as well as a remarkable example of ancient engineering skill. Due to the success of the project, the dam    2    (automatic) changes the water flow of the Min River and channels it into irrigation. For more than 2, 000 years, the dam    3    (continue) to make the most of the water protection works.

During the Warring States period,     4    troubled people living along the banks of Min River was the annual flooding.     5    (aid) by thousands of local people,   Qin governor and irrigation engineer Li Bing investigated the problem thoroughly and led a team    6     (construct) a levee (河堤) to redirect a portion of river’s flow. Then they cut a channel through Mount Yulei to discharge the extra water. With the system finished, no more floods    7     (occur). What’s more, it made Sichuan one of the most productive agricultural regions in China     8    the redirected water from the Min River could be used for irrigation. If you visit Dujiangyan, you will see    9    unusual construction that resembles a fish’s mouth. This famous attraction, Yuzui, together with two other important parts, namely, Feishayan and Baopingkou,     10    (be) designed initially to control the water flow throughout the year.