Each sentence has a mistake. Find it bychosing A B C or D

Before diamonds can be used as jewels, they must be cut and polish

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
Modern civilization is heavily dependent on energy. Without reliable power sources, e coulnt operate machines, use transportation, communicate via Internet, or do many other things. Although everyone recognizes the importance of energy, deciding what kind of energy the world should use in the future is not a simple task. The two leading candidates for this role are green energy and nuclear energy.
Currently, most of the energy we use is derived from fossil fuels. Although this energy source has got us this far, there are several problems with it. For starters, it is a finite resource which is quickly running out. Some analysts have even estimated that the Earth could run out of coal and oil within the next 50 years. Burning fossil fuels also creates large amount of pollution, which is harmful to the environment. Although fossil fuels still provide the majority of our power, governments are seeking better energy sources to use going forward.
Green energy is one option that is becoming increasingly attractive. It includes technologies such as solar, wind, and hydro power. These are seen as clean sources of energy because they cause very little pollution. In addition, they are completely renewable, so there is no danger that it will run out. The major disadvantage with green energy sources is that they are not cheap.
The other alternative is nuclear power. Like green energy, it is also a renewable source of power that will not run out, and it also doesn’t produce air pollution. In addition, nuclear power is more reliable than green energy, as it doesn’t depend on sunshine, rain, or wind to operate. The major issues with nuclear power are safety concerns and nuclear waste. Nuclear power plants create a considerable amount of nuclear waste which is extremely hazardous to people’s health. I they happen to have a meltdown, this could destroy the surrounding area for years to come.
The recent nuclear disaster in Fukushima, Japan brought this reality into the spotlight once again. In response, Germany announced it would close down eight of its nuclear plants immediately, and close the rest by 2022. Meanwhile, other nations refuse to give up on nuclear power, stating that these disasters are rare. The debate of whether to use green or nuclear power will likely continue for some time. In the end, it is quite possible that both energy sources will be used to fuel our planet.

What is the main problem with green energy?

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Perfectly smart adults feel intimidated by numbers and aren’t ashamed to say, “I hate math.” The new book “Math Art” could help change that by making the dreaded topic relevant and accessible to naturalists, artsy types, the philosophically inclined, and committed calculators alike. It illuminates an old lesson your math teachers probably tried to convey when you were a kid: Math dominates our lives even while we try with all our might to ignore it. In Math Art, released in April, science writer Ornes examines creative works inspired by math. It’s an aesthetically pleasing book with a delightfully tactile cover and satisfyingly thick and glossy pages that make it as fun to flip through as a fashion magazine. Chapters are dedicated to different concepts like pi, the golden ratio, equations in nature, and hyperbolic geometry. All of which may sound scary to the uninitiated but gain appeal when illustrated through sculpture, crochet, and painting. As Ornes explains in the introduction, math art isn’t new. Since ancient times, humans have visualized math in creative works. He argues that what is new is the mutual recognition that mathematicians and artists now show each other, increasingly gathering together at events dedicated to the intersection of aesthetics and numbers. “This is art by way of math and math by way of art, beauty at the crossroads,” Ornes writes.  His exploration begins with pi, the irrational mathematical constant 3.14159, plus some, ad infinitum. Pi, the ratio of the circumference of a circle to its diameter, represents mystery itself. Because the sequence never repeats, pi hints at the vastness of the universe. “It speaks to a world without bounds, since its digits go on forever,” Ornes explains. Pi is used for calculations in math and physics, and employed by math artist John Sims to make music, videos, drawings, paintings, quilts, clothing, and stories. Sims created and taught a math curriculum for students at the Ringling College of Art and Design in Sarasota, Florida, and has spent much of his career at the intersection of math and creativity. In Ornes’ book, he explains how he’s also used this fascination to connect with other people he might not otherwise meet, such as the Amish quilters who joined him to make pi quilts with each colored panel representing a number in the mathematical sequence.  
2. The word “illuminates” in paragraph 1 is closest in meaning to _______

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I ____ the latest Harry Potter book all day. I'm dying to know what happens in the end!

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The human desire for companionship may feel boundless, but research suggests that  our social capital is finite. Social scientists have used a number of ingenious approaches to gauge the size of people’s social networks; these have returned estimates ranging from about 250 to about 5,500 people. An undergraduate thesis from MIT focusing exclusively on Franklin D. Roosevelt, a friendly guy with an especially social job, suggested that he might have had as many as 22,500 acquaintances. Looking more specifically at friendship, a study using the exchange of Christmas cards as a proxy for closeness put the average person’s friend group at about 121 people.  However vast our networks may be, our inner circle tends to be much smaller. The average American trusts only 10 to 20 people. Moreover, that number may be shrinking: From 1985 to 2004, the average number of confidants that people reported having decreased from three to two. This is both sad and consequential, because whoever has strong social relationships tends to live longer than those who don’t. So what should you do if your social life is lacking? Just follow the research. To begin with, don’t dismiss the humble acquaintance. Even interacting with people with whom one has weak social ties has a meaningful influence on well-being. Beyond that, building deeper friendships may be largely a matter of putting in time. A recent study out of the University of Kansas found that it takes about 50 hours of socializing to go from acquaintance to casual friend, an additional 40 hours to become a “real” friend, and a total of 200 hours to become a close friend. If that sounds like too much effort, reviving dormant social ties can be especially rewarding. Reconnected friends can quickly recapture much of the trust they previously built, while offering each other a dash of novelty drawn from whatever they’ve been up to in the meantime. And if all else fails, you could start randomly confiding in people you don’t know that well in hopes of letting the tail wag the relational dog. The academic literature is clear: Longing for closeness and connection is pervasive. Which suggests that most of us are stumbling through the world pining for companionship that could be easily provided by the lonesome stumblers all around us.
4. The word “dismiss” in paragraph 3 is closest in meaning to _______

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Urban development is having a direct impact on the weather in (1) ______ cities worldwide. It has been noticed that the difference in temperature is usually greater at night and the phenomenon occurs in both winter and summer. Experts agree that this is due to urban development, when open green spaces are replaced with asphalt roads and tall brick or concrete buildings. These materials retain heat generated by the Sun and release it through the night. In Atlanta, in the US, this has even led to thunderstorms (22) ______ occur in the morning rather than, as is more common, in the afternoon. Large cities around the world are adopting strategies to combat this issue, (3) ______ it is not uncommon to find plants growing on top of roofs or down the walls of large buildings. In Singapore, the government has (4) ______ to transform it into a "city within a garden" and, in 2006, they held an international competition calling for entries to develop a master plan to help bring this about. One outcome was the creation of 18 "Supertrees" – metal constructions resembling very tall trees. Each one is a vertical freestanding garden and is (5) ______ to exotic plants and ferns. They also contain solar panels used to light the trees at night and also containers to collect rainwater, making them truly self-sufficient

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While many behaviors and practices associated with going green are designed to save  money, there are certain ways in which green living can actually be moderately to very expensive. Much of the technology associated with green living (1) ____________ provide benefits to the environment but often at a much higher cost than their traditional counterparts. For instance, the use of solar panels can potentially save you money on your energy bills, but they can (2) ______________ thousands of dollars to install. Energy-efficient appliances are designed to use less electricity and water but they often come with a high price tag.  Going green can also potentially have a negative effect on the environment. For (3) __________, the development of alternative fuels is an innovation in the green movement in an effort to reduce reliance on (4) ___________ natural resources. While these fuels are intended to reduce the toxic emissions caused by the burning of traditional gasoline, they may have unintentionally caused the opposite effect. One of these alternative fuels, E85, actually (5) ___________ more ozone into the atmosphere than traditional fuel. While ozone is a natural part of the Earth’s upper atmosphere, if it becomes concentrated in the lower atmosphere, it can potentially increase air pollution in areas where smog is a concern, which can in turn impact the health of those living in these areas

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Most languages have several levels of vocabulary that may be used by the same speakers. In English, at least three have been identified and described. Standard usage includes those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of a language and used in informal speech or writing, but not considered acceptable for more formal situations. Almost all idiomatic expressions are colloquial language. Slang, refers to words and expressions understood by a large number of speakers but not accepted as appropriate formal usage by the majority. Colloquial expressions and even slang may be found in standard dictionaries but will be so identified. Both colloquial usage and slang are more common in speech than writing. Colloquial speech often passes into standard speech. Some slang also passes into standard speech, but other slang expressions enjoy momentary popularity followed by obscurity. In some cases, the majority never accepts certain slang phrases but nevertheless retains them in their collective memories. Every generation seems to require its own set of words to describe familiar objects and events. It has been pointed out by a number of linguists that three cultural conditions are necessary for the creation of a large body of slang expressions. First, the introduction and acceptance of new objects and situations in the society; second, a diverse population with a large number of subgroups; third, association among the subgroups and the majority population. Finally, it is worth noting that the terms "standard", "colloquial", and "slang" exist only as abstract labels for scholars who study language. Only a tiny number of the speakers of any language will be aware that they are using colloquial or slang expressions. Most speakers of English will, during appropriate situations, select and use three types of expressions.
10. What does the author mean by the statement in lines 11-16: "Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of a language and used in informal speech or writing, but not considered acceptable for more formal situations."?
 

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Urbanization programmes are being carried out in many parts of the world, especially in densely (1) ________ regions with limited land and resources. It is the natural outcome of economic development and industrialization. It has brought a lot of benefits to our society. However, it also (2) ________ various problems for local authorities and town planners in the process of maintaining sustainable urbanization, especially in developing countries. When too many people cram into a small area, urban infrastructure can’t be effective. There will be a (3) ________ of livable housing, energy and water supply. This will create overcrowded urban districts with no proper facilities. Currently, fast urbanization is taking place predominantly in developing countries where sustainable urbanization has little relevance to people’s lives. Their houses are just shabby slums with poor sanitation. Their children only manage to get basic education. Hence, the struggle for (4) ________ is their first priority rather than anything else. Only when the quality of their existence is improved, can they seek (5) ________ other high values in their life

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The Red Bull team is considered as __________ finalist of the two teams.

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I/ can’t/ imagine/ life/ without/ science/ technology.

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Vietnam’s football team received a “rock-star” welcome in Hanoi yesterday, (1)_______ losing to Uzbekistan in the 2018 U23 Asian Championship Final. Thousands of supporters flocked to the streets from Noi Bai Airport to Hanoi’s city center to greet the team bus, (2)________the Vietnamese PM’s reception for the team by five hours. A home-coming celebration was also held at My Dinh National Stadium, where all 40,000 seats were filled with thousands more waiting outside to see the players. Their (3)______ at the U23 Asian Cup made the players “overnight celebrities in the football-crazy nation”, AFP wrote. Various Korean outlets, including Korea Times, Sportal Korea and Hani, have also expressed amazement at the way football fans have celebrated their national team’s achievement, and at the same time, hailed the team’s performance at the tournament (4)_____ “heroic” and “like a fairy tale”. According to Sportal Korea, the team made an “impressive achievement” at the Asian tournament. “The red flags were being waved everywhere on the streets, and the cheering went on until late,” Hani wrote. The Korea Times also added that Vietnam’s success at the Asian Cup had brought Vietnamese football and Korean football “closer”. More importantly, it is the success (5)_____unites the country on so many levels

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We live in a world of tired, sleep deprived people. In his book Counting Sheep, Paul Martin - a behavioral biologist - describes a society which is just too busy to sleep and which does not give sleeping the importance it deserves. Modern society has invented reasons not to sleep. We are now a 24/7 society where shops and services must be available all hours. We spend longer hours at work than we used to, and more time getting to work. Mobile phones and email allow us to stay in touch round the clock and late-night TV and the Internet tempt us away from our beds. When we need more time for work or pleasure, the easy solution is to sleep less. The average adult sleeps only 6.2 hours a night during the week, whereas research shows that most people need eight or even eight and a half hours’ sleep to feel at their best. Nowadays, many people have got used to sleeping less than they need and they live in an almost permanent state of “sleep debt”.  Until the invention of the electric light in 1879 our daily cycle of sleep used to depend on the hours of daylight. People would get up with the sun and go to bed at nightfall. But nowadays our hours of sleep are mainly determined by our working hours (or our social life) and most people are woken up artificially by an alarm clock. During the day caffeine, the world’s most popular drug, helps to keep us awake. 75% of the world’s population habitually consume caffeine, which up to a point masks the symptoms of sleep deprivation. What does a chronic lack of sleep do to us? As well as making us irritable and unhappy as humans, it also reduces our motivation and ability to work. This has serious implications for society in general. Doctors, for example, are often chronically sleep deprived, especially when they are on “night call”, and may get less than three hours’ sleep. Lack of sleep can seriously impair their mood, judgment, and ability to take decisions. Tired engineers, in the early hours of the morning, made a series of mistakes with catastrophic results. On our roads and motorways lack of sleep kills thousands of people every year. Tests show that a tired driver can be just as dangerous as a drunken driver. However, driving when drunk is against the law but driving when exhausted isn’t. As Paul Martin says, it is very ironic that we admire people who function on very little sleep instead of criticizing them for being irresponsible. Our world would be a much safer, happier place if everyone, whatever their job, slept eight hours a night  
7. Which of the following would the writer of the passage approve of?

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The cities in the United States have been the most visible sponsors and beneficiaries  of projects that place art in public places. They have shown exceptional imagination in applying the diverse forms of contemporary art to a wide variety of purposes. The activities observed in a number of “pioneer” cities sponsoring art in public places - a broadening exploration of public sites, an increasing awareness among both sponsors and the public of the varieties of contemporary artistic practice, and a growing public enthusiasm - are increasingly characteristic of cities across the country. With many cities now undergoing renewed development, opportunities are continuously emerging for the inclusion or art in new or renewed public environments, including buildings, plazas, parks, and transportation facilities. The result of these activities is a group of artworks that reflect the diversity of contemporary art and the varying character and goals of the sponsoring communities.  In sculpture, the projects range from a cartoonlike Mermaid in Miami Beach by Roy Lichtenstein to a small forest planted in New York City by Alan Sonfist. The use of murals followed quickly upon the use of sculpture and has brought to public sites the work of artists as different as the realist Thomas Hart Benton and the Pop artist Robert Rauschenberg. The specialized requirements of particular urban situations have further expanded the use of art in public places: in Memphis, sculptor Richard Hunt has created a monument to Martin Luther King, Jr., who was slain there; in New York, Dan Flavin and Bill Brand have contributed neon and animation works to the enhancement of mass transit facilities. And in numerous cities, art is being raised as a symbol of the commitment to revitalize urban areas.  By continuing to sponsor projects involving a growing body of art in public places, cities will certainly enlarge the situations in which the public encounters and grows familiar with the various forms of contemporary art. Indeed, cities are providing artists with an opportunity to communicate with a new and broader audience. Artists are recognizing the distinction between public and private spaces, and taking that into account when executing their public commissions. They are working in new, often more durable media, and on an unaccustomed scale.
3. All of the following are mentioned in paragraph 1 as results of the trend toward installing contemporary art in public places in the United States EXCEPT ____

In the mid - nineteenth century, the United States had tremendous natural resources that could be exploited in order to develop heavy industry. Most of the raw materials that are valuable in the manufacture of machinery, transportation facilities, and consumer goods lay ready to be worked into wealth. Iron, coal, and oil - the basic ingredients of industrial growth - were plentiful and needed only the application of technical expertise, organizational skill, and labor.

One crucial development in this movement toward industrialization was the growth of the railroads. The railway network expanded rapidly until the railroad map of the United States looked like a spider's web, with the steel filaments connecting all important sources of raw materials, their places of manufacture, and their centers of distribution. The railroads contributed to the industrial growth not only by connecting these major centers, but also by themselves consuming enormous amounts of fuel, iron, and coal.

Many factors influenced emerging modes of production. For example, machine tools, the tools used to make goods, were steadily improved in the latter part of the nineteenth century - always with an eye to speedier production and lower unit costs. The products of the factories were rapidly absorbed by the growing cities that sheltered the workers and the distributors. The increased urban population was nourished by the increased farm production that, in turn, was made more productive by the use of the new farm machinery. American agricultural production kept up with the urban demand and still had surpluses for sale to the industrial centers of Europe.

The labor that ran the factories and built the railways was recruited in part from American farm areas where people were being displaced by farm machinery, in part from Asia, and in part from Europe. Europe now began to send tides of immigrants from eastern and southern Europe - most of whom were originally poor farmers but who settled in American industrial cities. The money to finance this tremendous expansion of the American economy still came from European financiers for the most part, but the American were approaching the day when their expansion could be financed in their own " money market"

According to the passage, all of the following were true of railroads in the United States in the nineteenth century EXCEPT that

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Prosthetic body parts have been around in many shapes and forms for thousands of years. But up until just a few decades ago, they were often uncomfortable, provided little to no control for the user and didn’t look all that great either. Fast-forward to the present day and thanks to advances in medicine, robotics and neuroscience, a number of bionic body parts have been developed that have the power to be truly life-changing for those who need them the most, from a bionic eye to an artificial kidney to a thought-controlled robotic leg. Many of these bionic body parts are still in the early stages of production and are far from being rolled out to those that need them. That’s because there are all kinds of challenges to consider – not only the materials the body part is made from, but also integrating it into our bodies so it isn’t rejected, as well as developing ways for it to become part of our nervous system, so it behaves like any other limb or organ. Add to that the huge raft of financial, ethical, moral and political implications of enhancing our bodies with the help of technology. But it’s easy to overlook all of these concerns when the tech sounds so exciting, promising and like the robotic hands, arms and whole bodies of our sci-fi dreams. “The public perception of bionics is vastly different from the reality of prosthetics,” Kia Nazarpour, director of expertise in bio and environmental engineering, at Newcastle University, told us. "That’s thanks to science writers and researchers who showcase their work in a sci-fi oriented way to increase publicity."  
2. According to paragraph 1, what is the difference between artificial body parts before and today?

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In the folklore of the Navajo people, it was said that frogs and toads fell from the sky when it (1)________. The phenomenon that gave rise to this belief involved the spade foot toad, which remains dormant beneath the Sonoran Desert of Arizona, (2)_________ the heat and drought for as long as eight or nine months. With the onset of summer thunderstorms, however, the toads respond to the vibrations of drumming raindrops and emerge, as if fallen from the sky with the rain, (3)__________their brief and frantic mating season. The male spade foot sits in a muddy pool and fills the night with his calls, attempting to attract a female of the same species. Once a female joins him, she may lay as many as 1,000 eggs in the small pool of rainwater. From that point it’s a race against the elements for the young, (4)_________ must hatch and mature with remarkable speed before the pool evaporates beneath the searing desert sun. As the pool grows smaller and smaller, it became thick with tadpoles fighting for survival in the mud, threatened not only by the loss of their watery nest but also by devouring insects and animals. In as few as nine days after fertilization of the eggs, those lucky enough to survive develop through each tadpole stage and finally emerge as fully formed toads. After (5)______ themselves on insects, the young toads like their parents, burrow underground, where they will lie dormant awaiting the next summer’s storms

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The International Monetary Fund (IMF) is an organization of 189 member countries.  It stabilizes the global economy in three ways. First, it monitors global conditions and identifies risks. Second, it advises its members on how to improve their economies. Third, it provides technical assistance and short-term loans to prevent financial crises. The IMF’s goal is to prevent these disasters by guiding its members. These countries are willing to give up some of their sovereign authority to achieve that aim.  The IMF has the rare ability to look into and review the economies of all its member countries. As a result, it has its finger on the pulse of the global economy better than any other organization. The IMF produces a wealth of analytical reports. It provides the World Economic Outlook, the Global Financial Stability Report, and the Fiscal Monitor each year. It also delves into regional and country-specific assessments. It uses this information to determine which countries need to improve their policies. Hence, the IMF can identify which countries threaten global stability. The member countries have agreed to listen to the IMF’s recommendations because they want to improve their economies and remove these threats.  Since the Mexican peso crisis of 1994–95 and the Asian crisis of 1997–98, the IMF has taken a more active role to help countries prevent financial crises. It develops standards that its members should follow. For example, members agree to provide adequate foreign exchange reserves in good times. That helps them increase spending to boost their economies during recessions. The IMF reports on members countries’ observance of these standards. It also issues member country reports that investors use to make well-informed decisions. That improves the functioning of financial markets. The IMF also encourages sustained growth and high living standards, which is the best way to reduce members’ vulnerability to crises.  The IMF provides loans to help its members tackle balance of payments problems, stabilize their economies, and restore sustainable growth. Because the Fund lends money, it’s often confused with the World Bank. The World Bank lends money to developing countries for specific projects that will fight poverty. Unlike the World Bank and other development agencies, the IMF does not finance projects. Traditionally, most IMF borrowers were developing countries. They had limited access to international capital markets due to their economic difficulties. An IMF loan signals that a country’s economic policies are on the right track. That reassures investors and acts as a catalyst for attracting funds from other sources. All that shifted in 2010 when the Eurozone crisis prompted the IMF to provide short-term loans to bail out Greece. That was within the IMF’s charter because it prevented a global economic crisis.  The role of the IMF has increased since the onset of the 2008 global financial crisis. In fact, an IMF surveillance report warned about the economic crisis but was ignored. As a result, the IMF has been called upon more and more to provide global economic surveillance. It’s in the best position to do so because it requires members to subject their economic policies to IMF scrutiny. Member countries are also committed to pursuing policies that are conducive to reasonable price stability, and they agree to avoid manipulating exchange rates for unfair competitive advantage.
6. The word “capital” in paragraph 3 probably means ______.

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There is a scam aimed at a child’s desire to be a published writer - usually as a poet, in a book of poems. How does the scam work? Keen teachers are unwittingly caught up in the promotion but are completely unaware of the dodgy side of the scheme. There are plenty of honest opportunities for children’s writing that don’t cost their parents a small fortune and provide a poor-quality product. Most books in scams are badly set out. They tend to be huge volumes, squashing in as many writers’ efforts as possible to make as much money as possible. They’re an embarrassment for the young poets. These competitions to discover hidden talent sound great in the glossy flyers. Schools too are offered a prize if a winner is from their school. Schools become unpaid ‘agents’ in promotion of the competitions. Parents are happy to pay a small entry fee. Each child hopes to get an ‘honourable mention’ with the possibility of being selected to be included in a book. The price of the book is not given. Naturally, if a child’s work were published, parents would want a copy of the book. In one such scheme the pre-order price was $67 with an extra $26 if the child’s photo was included. That’s nearly $100! Strangely, awards are given to those who pre-order a book! The books are not attractive. A copy at a market sold for $2. There were three to five kids’ poems squashed on a page, with over 3000 poems jammed into that one book. Clip Art was used to illustrate the poor publication. Look at the maths. 3000 kids multiplied by $100 equals $300 000. Now add the entry fees of, say, $2 - add another $6000! Enough to cover publicity! One place winner’ was upset when the parents realised this was a con to buy a book, but not buying the book made the parents feel guilty. Genuine competitions that publish books give a free copy to any ‘winner’ 
2. Parents are likely to buy a copy of a book that includes their child’s work because ____

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The White House, the official home of the United State President, was not built in time for George Washington to live in it. It was begun in 1792 and was ready for its inhabitants, President and Mrs. John Adams, who moved in on November 1, 1800. When the Adams moved in, the White House was not yet complete, and the Adams suffered many inconveniences; for example, the main staircase was incomplete, which hindered movement from floor to floor, and the future laundry yard was merely a pool of mud, so wet laundry was hung in the unfinished East Room to dry. Thomas Jefferson, the third president, improved the comfort of the White House in many respects and added new architectural features such as the terraces on the east and west ends. When the British forces burned the White House on August 24, 1818, President Madison was forced to leave. All the remained after the fire was the exterior walls, the interior was completely destroyed. It was not until December of 1817 that the following president, James Monroe was able to move into a rebuilt residence. Since then, the White House has continued to be modified but has been continuously occupied by each succeeding US president.
7. The word "forces" in paragraph 2 could best be replaced by .

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Stabilisation work means the Leaning Tower of Pisa is leaning slightly less than it used to, experts have said. The tower, which has leaned to one side ever since it began to take shape in 1173, has lost 4cm of its tilt over the past two decades, according to a report from the surveillance group that meets every three months to give updates on the monument’s condition “Since restorative work began, the tower is leaning about half a degree less,” said Nunziante Squeglia, a geotechnics professor at the University of Pisa who works with the group. “But what counts is the stability of the tower, which is better than initially predicted.” The structure, which was badly damaged during the second world war, was closed to the public in 1990 over safety fears and did not reopen for 11 years. The surveillance group was set up in 2001 ago after Michele Jamiolkowski, an engineer of Polish origin, coordinated an international committee to save the landmark. The bell tower, a symbol of the power of the maritime republic of Pisa in the Middle Ages, was defective from the beginning due to the porous clay soil beneath its foundations. After three floors were completed, construction stopped and did not resume until 90 years later when workers started building additional floors on a diagonal to offset the lean. But work was again disrupted before finally being completed in 1372. The tower, located behind Pisa’s cathedral, attracts more than 5 million visitors a year. Reaching the top requires climbing 269 steps. The surveillance group’s work, which is funded by the non-profit Opera della Primaziale Pisana, includes improving the quality of the structure’s conservation and promoting research.
1. Which best serves as the title for the passage?