Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. 
         The growing popularity of the video games, online gaming and videos make the children inactive in their daily routine. The time (1) ________________ has been spent watching online videos and games can be better utilized by doing some physical activities. Here, parents can become a role model in their children’s life. The parents should not make them addictive to the techie-gadgets and be active in their lifestyle so that their kids can also become physically (2) _______________ and active.
        The best way to become a physically fit is to be active in sports and games. The importance of sports in our life is crucial. It not only makes a body physically fit and active but also contributes (3) ______________ the mental growth and development. An active participation in sports and games can have many benefits in students’ life. It gives a student a chance to enhance the physical and the social skills. It offers a child a change from a monotony of a daily routine. It keeps the stress and anxiety away. However, a proper balance has to be maintained between a child’s maturity, skills and interests.
            Nowadays, sports and games are taken to be a good career option as well. It plays a pivotal role in shaping a child’s interest towards his profession. Sports and games also help in character building and provide strength and energy. Sport is a form of a competitive physical activity (4) ______________ by a person via an organized or a casual participation. Sports and games not only involve the development of skills but it also stimulates the competitive behavior among students. It builds up the confidence in the minds of the students. It not only strengthens the physical growth rather it also contributes towards the mental growth. (5) ______________, it plays an important role in a student’s life.

(5).......................

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Orbis is an organisation which helps blind people of everywhere. It has built an eye hospital inside an aeroplane and flown it all over the world with an international medico team. Samantha Graham, a fourteen-year-old schoolgirl from England, went with the plane to Mongolia. Samantha tells the story, of the Eukhtuul, a young Mongolian girl.
'Last year, when Eukhtuul was walking home from school, she was attacked by boys with sticks and her eyes were badly damaged. Dr. Duffey, an Orbis doctor, said that without an operation she would never see again, I thought about all the things I do that she couldn't, things like reading schoolbooks, watching television, seeing friends, and I realised how lucky I am.'
'The Orbis team agreed to operate on Eukhtuul and I was allowed to watch, together with some Mongolian medical students. I prayed the operation would be successful. The next day I waited nervously with Eukhtuul while Dr. Duffey removed her bandages. "In six  months your sight will be back to normal," he said. Eukhtuul smiled, her mother cried, and I had to wipe away some tears, too!'
Now Eukhtuul wants to study hard to become a doctor. Her whole future has changed thanks to a simple operation. We should all think more about how much our sight means to us.’

After meeting Eukhtuul, Samantha felt     .

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By mid-century, there will likely be 9 billion people on the planet, consuming ever more resources and leading ever more technologically complex lives. What will our cities be like? How much will artificial intelligence advance? Will global warming trigger catastrophic changes, or will we be able to engineer our way out of the climate change crisis?
Making predictions is, by nature, a dicey business, but to celebrate the 40th anniversary of Smithsonian magazine Big Think asked top minds from a variety of fields to weigh in on what the future holds 40 years from now. The result is our latest special series, Life in 20 50. Demographic changes in world population and population growth will certainly be dramatic. Rockefeller University mathematical biologist Joel Cohen says it's likely that by 2050 the majority of the people in the world will live in urban areas, and will have a significantly higher average age than people today. Cities theorist Richard Florida thinks urbanization trends will reinvent the education system of the United States, making our economy less real estate driven and erasing the divisions between home and work.
Large migrations from developing countries like Indonesia, Malaysia, Bangladesh, Mexico, and countries in the Middle East could disrupt western governments and harm the unity of France, Germany, Spain, the Netherlands, Poland, and the United Kingdom under the umbrella of the European Union.
And rapidly advancing technology will continue ever more rapidly. According to Bill Mitchell, the late director of MIT's Smart Cities research group, cities of the future won't look like "some sort of science -fiction fantasy" or "Star Trek" but it's likely that "discreet, unobtrusive" technological advances and information overlays, i.e. virtual reality and augmented reality, will change how we live in significant ways. Self-driving cars will make the roads safer, driving more efficient, and provide faster transports. A larger version of driverless cars-driverless trucks-may make long haul drivers obsolete.
Meanwhile, the Internet will continue to radically transform media, destroying the traditional model of what a news organization is, says author and former New York Times Public Editor, Daniel Okrent, who believes the most common kinds of news organizations in the future will be "individuals and small alliances of individuals” reporting and publishing on niche topics.

What is the problem caused by advanced technology for future humans in paragraph 5?

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In the United States in the early 1800's, individual state governments had more effect on the economy than did the federal government. States chartered manufacturing, banking, mining, and transportation firms and participated in the construction of various internal improvements such as canals, turnpikes, and railroads. The states encouraged internal improvements in two distinct ways; first, by actually establishing state companies to build such improvement; second, by providing part of the capital for mixed public-private companies setting out to make a profit.
In the early nineteenth century, state governments also engaged in a surprisingly large amount of direct regulatory activity, including extensive licensing and inspection programs. Licensing targets reflected both similarities in and differences between the economy of the nineteenth century and that of today: in the nineteenth century, state regulation through licensing fell especially on peddlers, innkeepers, and retail merchants of various kinds. The perishable commodities of trade generally came under state inspection, and such important frontier staples as lumber and gunpowder were also subject to state control. Finally, state governments experimented with direct labor and business regulation designed to help the individual laborer or consumer, including setting maximum limits on hours of work and restrictions on price-fixing by businesses.
Although the states dominated economic activity during this period, the federal government was not inactive. Its goals were the facilitation of western settlement and the development of native industries. Toward these ends the federal government pursued several courses of action. It established a national bank to stabilize banking activities in the country and, in part, to provide a supply of relatively easy money to the frontier, where it was greatly needed for settlement. It permitted access to public western lands on increasingly easy terms, culminating in the Homestead Act of 1862, by which title to land could be claimed on the basis of residence alone. Finally, it set up a system of tariffs that was basically protectionist in effect, although maneuvering for position by various regional interests produced frequent changes in tariff rates throughout the nineteenth century.

The word “ends” in line 20 is closest in meaning to

Read the passage below and decide whether the statements are TRUE or FALSE?

   In 1981, the Association of Zoos and Aquariums (AZA) created a Species Survival Plan (SSP) in order to help preserve specific endangered and threatened species through captive breeding. With over 450 SSP Plans, there are a number of endangered species that are covered by the AZA with plans to cover population management goals and recommendations for breeding for a diverse and healthy population, created by Taxon Advisory Groups. These programs are commonly created as a last resort effort. SSP Programs regularly participate in species recovery, veterinary care for wildlife disease outbreaks, and a number of other wildlife conservation efforts. The AZA's Species Survival Plan also has breeding and transfer programs, both within and outside of AZA - certified zoos and aquariums. Some animals that are part of SSP programs are giant pandas, lowland gorillas, and California condors.

   Some animals that are part of SSP programs are giant pandas, lowland gorillas, and California condors.

The Association of Zoos and Aquariums (AZA) created a Species Survival Plan in 1988

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In the American colonies there was little money. England did not supply the colonies with coins and did not allow the colonies to make their own coins, except for the Massachusetts Bay Colony, which received permission for a short period in 1652 to make several kinds of silver coins. England wanted to keep money out of America as a means of controlling trade: America was forced to trade only with England if it did not have the money to buy products from other countries. The result during this pre-revolutionary period was that the colonists used various goods in place of money: beaver pelts, Indian wampum, and tobacco leaves were all commonly used substitutes for money. The colonists also made use of any foreign coins they could obtain. Dutch, Spanish, French, and English coins were all in use in the American colonies.
During the Revolutionary War, funds were needed to finance the world, so each of the individual states and the Continental Congress issued paper money. So much of this paper money was printed that by the end of the war, almost no one would accept it. As a result, trade in goods and the use of foreign coins still flourished during this period.
By the time the Revolutionary War had been won by the American colonists, the monetary system was in a state of total disarray. To remedy this situation, the new Constitution of the United States, approved in 1789, allowed Congress to issue money. The individual states could no longer have their own money supply. A few years later, the Coinage Act of 1792 made the dollar the official currency of the United States and put the country on a bimetallic standard. In this bimetallic system, both gold and silver were legal money, and the rate of exchange of silver to gold was fixed by the government at sixteen to one.

The Massachusetts Bay Colony was allowed to make coins

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Though Edmund Halley was most famous because of his achievements as an astronomer, he was a scientist of diverse interests and great skill. In addition to studying the skies, Halley was also deeply interested exploring the unknown depths of the oceans. One of his lesser-known accomplishments that was quite remarkable was his design for a diving bell that facilitated exploration of the watery depths.
The diving bell that Halley designed had a major advantage over the diving bells that were in use prior to his. Earlier diving bells could only make use of the air contained within the bell itself, so divers had to surface when the air inside the bell ran low.
Halley's bell was an improvement in that its design allowed for an additional supply of fresh air that enabled a crew of divers to remain underwater for several hours.
The diving contraption that Halley designed was in the shape of a bell that measured three feet across the top and five feet across the bottom and could hold several divers comfortably; it was open at the bottom so that divers could swim in and out at will. The bell was built of wood, which was first heavily tarred to make it water repellent and was then covered with a half-ton sheet of lead to make the bell heavy enough to sink in water. The bell shape held air inside for the divers to breathe as the bell sank to the bottom.
The air inside the bell was not the only source of air for the divers to breathe, and it was this improvement that made Halley's bell superior to its predecessors. In addition to the air already in the bell, air was also supplied to the divers from a lead barrel that was lowered to the ocean floor close to the bell itself. Air flowed through a leather pipe from the lead barrel on the ocean floor to the bell. The diver could breath the air from a position inside the bell, or he could move around outside the bell wearing a diving suit that consisted of a lead bell-shaped helmet with a glass viewing window and a leather body suit, with a leather pipe carrying fresh air from the diving bell to the helmet.

The expression ran low in paragraph 2 is closest in meaning to

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Orbis is an organisation which helps blind people of everywhere. It has built an eye hospital inside an aeroplane and flown it all over the world with an international medico team. Samantha Graham, a fourteen-year-old schoolgirl from England, went with the plane to Mongolia. Samantha tells the story, of the Eukhtuul, a young Mongolian girl.
'Last year, when Eukhtuul was walking home from school, she was attacked by boys with sticks and her eyes were badly damaged. Dr. Duffey, an Orbis doctor, said that without an operation she would never see again, I thought about all the things I do that she couldn't, things like reading schoolbooks, watching television, seeing friends, and I realised how lucky I am.'
'The Orbis team agreed to operate on Eukhtuul and I was allowed to watch, together with some Mongolian medical students. I prayed the operation would be successful. The next day I waited nervously with Eukhtuul while Dr. Duffey removed her bandages. "In six  months your sight will be back to normal," he said. Eukhtuul smiled, her mother cried, and I had to wipe away some tears, too!'
Now Eukhtuul wants to study hard to become a doctor. Her whole future has changed thanks to a simple operation. We should all think more about how much our sight means to us.’

The word "she" in the passage refers to     .

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks.
          The Microscope
One of the most important inventions in the development of science and medicine was the microscope. It was (1) ........... the principle that light could be “refracted” or bent, by a glass lens. It was soon discovered that tiny objects could be magnified (2)......... size when viewed through a glass lens that had been ground and polished in a specific (3) ........... Although the principle was known to the Chinese as early as 1000 A.D, it was not until the 13th and 14th centuries in Europe (4)..........it was put to practical use in the form of eyeglasses.
In Europe the first microscope was invented by brothers Zacharias and Hans Janssen, two Dutch eyeglass-makers, around 1590. They built a “compound” microscope, so called because of its two lenses. The most significant development and use of the microscope during this period, however, belongs to another Dutch optician, Antonie van Leeuwenhoek. Bom in Delft, Holland, he became skilled at (5).......... very sharp and accurate magnifying lenses.
(5)........................

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Set in the red desert of central Australia is the mining town of Coober Pedy. At first sight, the town looks similar to many other such communities, but Coober Pedy is different. Sixty per cent of its population of 4,000 people lives underground. There are today about 800 underground houses as well as shops, hotels and even churches in the town and the surrounding hills. Once a site has been chosen, special tunneling machines are (1)............in to create passages and rooms in the sandstone. Rock pillars are left to support the roof, and doors and windows are cut into the front. Houses are of all shapes and (2)......., the largest having twenty rooms, and some even have their own swimming poll.
Living underground may sound strange but in fact it has a number of advantages. In summer, the temperature outside can reach an astonishing 47°C, and in winter the nights can be (3)...... cold.
However, inside the houses it remains a steady 25°C all year round. Many people say that living underground makes they feel very secure. There is no problem with noise from the neighbours and the houses are not affected. By the fierce dust storms that regularly sweep (4)........the area. And of course,  if  your family (5)........... or lots of friends come to stay, you can always dig another room.
(3)..........................

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From time immemorial, cities have been the central gathering places of human life, from where the great ideas and movements of the world have sprouted. In this country, the beginnings of our independence fomented with the Boston Tea Party, while Philadelphia served as the home of the Constitutional Convention. The seeds of economic and financial power were sowed on the streets of New York City. Around the world, the great thinkers of the Renaissance assembled in Florence, the impressionist painters flocked to Paris, and the industrial revolution sparked in Birmingham England.
Hundreds of years later, great ideas and innovations are still sprouting in cities – but this time accompanied by a growth in urbanized life over the last several decades never before seen. For the first time in history, more people are living in cities than rural areas. And, this way of living is only going to continue: by 2050, the urban share of global population is projected to surpass 66 percent (up from 30 percent in 1950). This trend to urbanization is even more dramatic beyond the borders of the United States. Take Nigeria's capital, Lagos, which had a population of approximately 7.2 million in 2000, and is expected to rise to 24 million by 2030. And, eight times more Nigerians live in cities today than in 1975. Moreover, the metro areas of Tokyo, New York and Mexico City were the only metro areas in 1975 with at least 10 million people. Today, that list would include 31 such megacities – with 10 more to join by 2030 – all of which are outside the United States.
Cities are undergoing what Brookings Institution author Bruce Katz terms the "metropolitan revolution." Financial capitals New York and London are transforming into major world tech hubs as new and innovative companies emerge within these cities. And, this shift is not exclusive to New York or London, as many cities are undergoing similar transformations driven by this global trend toward urbanization. This wave of urban growth stems, in large part, from the mass adoption of the internet and interconnected technologies. Interestingly, many sociologists predicted years ago that the advent of such interconnectivity would enable people to live and work anywhere. But the practical result has been the opposite.
Indeed, in this new 21st century economy, innovative workers seek one another to collaborate in building and developing new knowledge-based industries that are increasingly disrupting and dominating a rapidly evolving global economy. Bright, curious minds in the sciences and technology demand proximity in order to be more productive, more creative and further stimulated. This need for collaboration has propelled millennials to move to urban areas in droves. But once they get there, they desire new open physical environments – such as incubators and shared work places – to enhance their collaborative efforts. Beyond work, a growing single population – one that now outnumbers married people in the United States – seeks out other singles amid the myriad activities and diverse nightlife that only cities offer.

Câu 39. Which of the following is NOT true about the urban population?

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There are many mistakes that people make when writing their resume (CV) or completing a job application. Here are some of the most common and most serious.
The biggest problem is perhaps listing the duties for which you were responsible in a past position: all this tells your potential employers is what you were supposed to do. They do not necessarily know the specific skills you used in executing them, nor do they know what results you achieved - both of which are essential. In short, they won’t know if you were the best, the worst or just average in your position.
The more concrete information you can include, the better. As far as possible, provide measurements of what you accomplished. If any innovations you introduced saved the organization money, how much did they save? If you found a way of increasing productivity, by what percentage did you increase it?
Writing what you are trying to achieve in life - your objective - is a waste of space. It tells the employer what you are interested in. Do you really think that employers care what you want? No, they are interested in what they want! Instead, use that space for a career summary. A good one is brief - three to four sentences long. A good one will make the person reviewing your application want to read further.
Many resumes list ‘hard' job-specific skills, almost to the exclusion of transferable, or ‘soft’, skills. However, your ability to negotiate effectively, for example, can be just as important as your technical skills.
All information you give should be relevant, so carefully consider the job for which you are applying. If you are applying for a job that is somewhat different than your current job, it is up to you to draw a connection for the resume reviewer, so that they will understand how your skills will fit in their organization. The person who reviews your paperwork will not be a mind reader.
If you are modest about the skills you can offer, or the results you have achieved, a resume reader may take what you write literally, and be left with a low opinion of your ability: you need to say exactly how good you are. On the other hand, of course, never stretch the truth or lie.

According to the passage, what information should candidates include in their resume?

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Except for a few unfortunate individuals, no law in this world can go against the fact that for most of us our family is an essential part of our lives. The moment you enter this cruel world, where each man is for himself, there are some near and dear ones out there who will do anything to ensure your happiness. We are nothing more than a vulnerable and fragile object, without someone taking care of us on our arrival in this world. Despite all the odds, your family will take care of your wellbeing, and try their best to provide you the greatest comforts in the worled. No one out there, except your family must forgive the endless number of mistakes you may make in your life. Apart from teaching you forgive and forget
lessons, they are always there for you, when you need them the most.
Family is the only place where children study a lot after school. In school, teachers teach children about the subjects which will help them to find a good job in future. But at home, parents teach children about good habits. They are not only the elements which help the children to shape their personalities but they also prepare them a suitable and bright future.
A good family makes a greater society. Father, mother, and children have to work in order to build a strong family. If any one of them fails, the whole family may collapse. The good name of the whole family can be ruined by a single member of the family. In order to avoid that unhappy scenario, every family member has to work hard and try their best. As a result, they will set good examples for the whole society. Families have a powerful impact on society and societies create countries.

According to the passage, which of the following is TRUE about the relation between family and society?

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Robots are useful for exploring and working in space. In particular, many robots have been sent to explore Mars. Such robots have usually looked like a box with wheels. Though these robots are useful, by their very nature they are unreliable, extremely expensive, and they break easily. Also, they cannot do very many tasks. Because of these problems, scientists have been developing a new and unusual kind of robot. These new robots move like snakes, so they have been given the name "snakebots."
The way a snake is shaped lets it get into very small spaces, like cracks in rocks. It can also push its way below the ground or climb up different kinds of objects, like high rocks and trees. Such abilities account for the usefulness of a robot designed like a snake. A snakebot would be able to do these things, too, making it much more effective than regular robots with wheels, which easily get stuck or fall over. Since they can carry tools, snakebots would be able to work in space, as well. They could, for example, help repair the International Space Station.
But how can such a robot shape be made? A snakebot is built like a Chain made of about thirty parts, or modules. Each module is basically the same in that they all have a small computer and a wheel to aid movement. The large computer in the "head” of the snake makes all of the modules in a snakebot work together.
The modular design of the snakebot has many advantages. If one module fails, another can be added easily. Snakebot modules can also carry different kinds of tools, as well as cameras. Since each module is actually a robot in itself, one module can work apart from the rest if necessary. That is, all the modules can separate and move on their own, and then later, reconnect back into a larger robot.
Researchers are also trying to develop snakebots made of a special kind of plastic that can change its shape using electricity, almost like animal muscles. Snakebots made with this plastic will be very strong and hard to break.
Overall, the snakebot design is much simpler than that of common robots. Thus, snakebots will be much less expensive to build. For example, a robot recently sent to Mars cost over a hundred million dollars, whereas snakebots can cost as little as a few hundred dollars. With their versatility and affordability, snakebots seem to be the wave of the future, at least as far as space robots are concerned.

According to paragraph 1, the following are disadvantages of the common robots which have been on Mars, EXCEPT     .

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The hard, rigid plates that form the outermost portion of the Earth are about 100 kilometers thick. These plates include both the Earth's crust and the upper mantle. The rocks of the crust are composed mostly of minerals with light elements, like aluminum and sodium, while the mantle contains some heavier elements, like iron and magnesium. Together, the crust and upper mantle that form the surface plates are called the lithosphere. This rigid layer floats on the denser material of the lower mantle the way a wooden raft floats on a pond. The plates are supported by a weak, plastic layer of the lower mantle called the asthenosphere. Also like a raft on a pond, the lithospheric plates are carried along by slow currents in this more fluid layer beneath them.
With an understanding of plate tectonics, geologists have put together a new history for the Earth's surface. About 200 million years ago, the plates at the Earth's surface formed a “supercontinent” called Pangaea. When this supercontinent started to tear apart because of plate movement, Pangaea first broke into two large continental masses with a newly formed sea that grew between the land areas as the depression filled with water. The southern one — which included the modern continents of South America, Africa, Australia, and Antarctica — is called Gondwanaland. The northern one — with North America, Europe, and Asia — is called Laurasia. North America tore away from Europe about 180 million years ago, forming the northern Atlantic Ocean. Some of the lithospheric plates carry ocean floor and others carry land masses or a combination of the two types. The movement of the lithospheric plates is responsible for earthquakes, volcanoes, and the Earth's largest mountain ranges. Current understanding of the interaction between different plates explains why these occur where they do. For example, the edge of the Pacific Ocean has been called the “Ring of Fire” because so many volcanic eruptions and earthquakes happen there. Before the 1960's, geologists could not explain why active volcanoes and strong earthquakes were concentrated in that region. The theory of plate tectonics gave them an answer.

The author compares the relationship between the lithosphere and the asthenosphere to which of the following?

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Around the year 1500, hunting people occupied the entire northern third of North America. They lived well from the animals with which they shared these lands. Hunters of sea mammals had colonized the Arctic coasts of Canada and Greenland between four and five thousand years before. Land-hunting people had lived throughout much of the northern interior for at least 12,000 years.
Northern North America is part of a larger circumpolar ecological domain that continues across the narrow Bering Strait into Siberia and northern Europe. The overall circumpolar environment in the 1500's was not very different from the environment of the present. This vast landmass had a continental climate and was dominated by cold arctic air throughout a long winter and spring season. Summer temperature ranged from near freezing to the mid-20's Celsius, while winter temperature were often as low as 40 degrees below zero Celsius.
Geographers divide the overall circumpolar domain into two zones, the Arctic and, below it, the Subarctic. They refer to the landforms of these areas as tundra and taiga, respectively.
Temperatures in the northern lands were below freezing for eight or nine months of the year. Subsurface soil in the Arctic's tundra remained permanently frozen. Even when summer temperatures were above freezing and the top inches of earth became saturated with water, the soil below remained frozen into a permafrost, as hard as rock. When water flowed upon the surface of permanently frozen tundra, it made overland travel extremely difficult. Summer travel in the boggy lands, or muskeg country, of the Sub Arctic’s taiga was also slow and arduous. Tracking animals was more difficult than it was during the winter when the swampy ground was frozen solid and covered with snow. In both tundra and taiga, hordes of mosquitoes and biting flies bred in the standing pools of water. Clothing lost its thermal efficiency when it became damp. Northern people looked forward to the turn of the season to bring the easier traveling conditions associated with cold weather. In the Arctic, they could haul food and supplies by dogsled while in the Subarctic; people could travel quickly and efficiently by snowshoes and toboggan.

Which of the following terms is used to describe the landforms of the Arctic region?

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In Germany, it's important to be serious in a work situation. They don't mix work and play so you shouldn't make jokes (1) ............... you do in the UK and USA when you first meet people. They work in a very organized way and prefer to do one thing at a time. They don't like interruptions or (2)  ............... changes of schedule. Punctuality is very important so you should arrive on time for appointments. At meeting, it’s important to follow the agenda and not interrupt (3) ............... speaker. If you give a presentation, you should focus (4) ............... facts and technical information and the quality of your company's products. You should also prepare well, as they may ask a lot of questions. Colleagues normally use the family names, and title - for example 'Doctor' or 'Professor', so you shouldn't use first names (5) ............... a person asks you to.

They don't like interruptions or (2)  ............... changes of schedule

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     The string family is the largest section of the orchestra. The four main stringed instruments look similar but are all different sizes. Each can be played by plucking the strings with the fingers or with a bow, which is pulled (1) _______ across the instrument's four strings.

      The VIOLIN is the smallest of the string instruments and can play the highest (2) ________. The violin often plays the melody - this is the tune you will be humming after you leave a performance. The VIOLA is slightly larger than the violin. Because it is bigger, it can play lower notes. (3) _______ the viola is only a little bit bigger than the violin, it can be hard to tell them apart. The viola plays many beautiful melodies just like the violin.

      The CELLO is (4) ________ the violin and the viola. It is so large that the cellist must sit on a chair holding the cello between his or her knees in order to play. The cello often plays accompaniment parts.

      Because it is the largest of the stringed instruments, the DOUBLE BASS plays the lowest notes. This instrument is so large that the bass players have to stand up or sit on tall stools to play it. The bass often plays (5) ________ parts with the cello.

(1)...................

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Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic flash can therefore be used to capture high- speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoflash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense flash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”
The evolution of the photoflash was slow, flashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The flash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen difluoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reflecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

The word "it" in paragraph 2 refers to     .

Choose the option that best completes each of the following sentences.
Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.
The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month.
But David's biggest headache is what to do with his money.
Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.
He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.
David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew 1 had already written some programs," he said.
"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.
"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."
David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

He was employed by the company because...................