Genome editing brings many exciting possibilities.     1    is well-known to you, genes play a critical role in shaping our lives, and our own personal genome contains information that helps determine our lifespan and affects our chances of contracting certain diseases. As a result, geneticists    2     (try) to identify which genes relate to which diseases, as they believe genome editing is     3    effective means of disease treatment and prevention. In the near future, it will serve as a new weapon in the fight against diseases,     4    (lead) to a fundamental change in our approach to health care. However,     5    the technology continuing to develop at a fast pace, questions arise about how to use it    6    (appropriate). Genome editing also brings us some moral problems. Therefore, many people have all started     7    (wrestle) with such issues. We have to find out how to keep the technology from running wild. This means    8    (put) appropriate controls in place to make sure that genome editing will work to our advantage. If we didn’t have them, genome editing could be as dangerous as a car out of control. In a word, there     9    (be) still much to be explored and debated on genome editing. Without doubt, genome editing is one of the    10    (great) innovations in the history of science.

Wood-block 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 wood block 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 easier    8    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).

Whether they are playing on our TV screens or printed in newspapers, advertisements are everywhere.

They     1    (appear) since the 18th and 19th century when advances in printing techniques allowed more detailed images     2     ( produce ) in newspapers and magazines. Advertising often serves as an indicator for       3    society considers to be socially acceptable and desirable at the time.

In spite of being designed to sell     4    advertise something, some ads can even have a    5    (tend) to become part of a society's dialect. For example, in the UK, if someone describes themselves     6    a “Marmite Person”, this means that you may either love them or hate them,     7    (base) on the British food Marmite’s slogan (标语), “Love it or hate it.”

The average person living in a city sees thousands of ads every single day. It seems that ads are a    8    (big) part of everyday life than we think they are. Instead of finding them    9    (trouble), however, at least we can be assured that future generations will have an interesting way to see how we lived—no matter how     10    (great) today’s world may change to them.

The ancient Olympic Games began in the year 776 BCE.     1     , they died out around the year 393. It was in 1896, in Athens that the modern Olympic Games     2     (hold) first. A Frenchman Pierre de Coubertin     3     dream was that the Olympics would make it possible for people     4     ( live ) side by side in peace brought the Olympics back to life. Since then, motivated by the Olympic motto “Faster, Higher, Stronger”, thousands of     5     (high) trained and talented athletes     6     (devote) themselves to achieving sporting excellence and pushing the boundaries of human achievement, such as Muhammad Ali, Michael Jordan, Jessica Ennis-Hill and so on.

Chinese athletes have also made important     7     (contribute) to the Olympics. At the 1984 Los Angeles Olympic Games, China returned     8     the Olympics after 32 years’ absence and Xu Haifeng won our country’s first-ever gold medal. At the 2004 Athens Olympic Games, Liu Xiang became the first Asian     9     (win) the gold medal in the men’s 110-metre hurdles. In 2008, in addition to hosting the Olympic for the first time, China also ranked first in the medal table. The year 2022 was another historic moment for China, as Beijing won     10     election to host the Winter Olympics.