Woodblock printing first appeared in the early Tang period. During the Song dynasty, the technique of block printing was very advanced. Books were     1    (beautiful) printed. Even today the books     2    (print) at the time are valuable and treasured by libraries and book collectors.

However, block printing     3    (be) not very convenient. Every two pages of a book had to be carved on a woodblock, and a big book would require many blocks. Besides, there had to be large places for storing the books.     4     (overcome) these shortcomings, Bi Sheng invented the movable type during the years between 1041 and 1048. One word was carved on one piece of clay,     5     was hardened with fire. Then clay characters were set on     6     iron plate according to the text of a book. Then ink was applied to them and     7    (sheet) of paper spread over them, and the printing was done. Bi Sheng’s invention made printing faster and     8    (easy) than before. Later, movable type of metal and wood was made and widely used.

The technique of printing was gradually known to other Asian countries and Europe. The great influence printing had     9    the advance of civilization is too clear to need any     10    (explain).

John Snow was a well-known physician in London in the 19th century.     1     famous was he that he even attended Queen Victoria to ease the birth of her babies. However, he decided to defeat cholera, a     2     (dead) disease at that time when he saw thousands of people     3       (expose) to it died every time there was an outbreak.

In 1854 when cholera broke out, he began to gather information and marked on a map     4     all the dead people     5    （live）. He found many people who had drunk     6     dirty water from the pump died. So he decided that the polluted water carried cholera. He found a woman and her daughter who had the water     7    （deliver） from the pump every day died of cholera after drinking the water.     8     this extra evidence John Snow announced that the polluted water was     9    （blame）. He suggested the source of all water supplies should be examined and new methods of     10    （deal）with water be found. Finally, “King Cholera” was defeated.

3 . RMS Titanic was a British ship that sank (沉没) in the North Atlantic Ocean in the early morning hours of April 15,1912. There were about 2,224 people aboard the ship, more than 1,500 of    1    died, making it one of the    2    (bad) ocean disasters in modern history.

So far the ship    3    (rest) on the ocean floor for more than a century. In 2012 the first curious tourists were brought to it and saw the ship themselves. Now people will once again get the chance    4    (visit) the Titanic. This could be one of the last    5    (chance). A 2016 study showed that a bacteria (细菌) could eat away what    6    (leave) of the famous ship inside 15 or 20 years.

The eight-day journey will transport visitors in an undersea boat    7    the final resting place of the Titanic. The first trip is already    8    (full) booked, though the experience costs 105,129 dollars per person. Visitors will have a great time around the vast field where the Titanic rests, home to    9    great many ancient treasures,    10    (remain) untouched for over a century.

4 .     1    crowd of more than 22,000 people gathered near Las Vegas’ famous Mandalay Bay Hotel    2    the Route 91 Harvest Festival. Without    3    (expect), from the hotel’s 32^nd floor, a gunman opened fire on the people below,       4    (kill)59 people and at least 500 injured. It was the most     5    (dead)shooting in US history. President Donald Trump described     6    as “an act of pure evil”. He ordered US flags to be    7    (fly)at half-staff to honor those     8    died. “In moments of tragedy and horror, America comes together as one. And it always     9    (have),” Trump said    10     (Politician) around the world offered their support for the United States.

5 . A best friend is someone to     1     you can tell everything, even your most     2     (person) feelings and thoughts. Anne Frank treated her diary     3     her best friend. The German Nazis were in search of Anne and her family. The family had to     4     away from the chase. They didn’t dare to go out even in the evenings. They had to stay indoors day and night. Not     5     (be) able to go out for such a long time, Anne missed the beauty of nature so much that she grew     6     about everything to do with it. She stayed up     7     eleven thirty one evening on     8     just to see the moonlight. She said, “This is the first time I     9     (see) the moonlight since I came here.”

    10     (fortunate), the family were discovered at last and taken away from the hiding place.