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 from 1 to 5.
BOOKS
Nearly all the discoveries that have been made through the ages can (1)________ in books. The invention of the book is one of humankind’s (2)________ achievements,  the importance of which can not be evaluated. Books are very useful, providing us with both entertainment and information. The production of books began in Ancient Egypt, though not in the form that is accessible to us today. The books read by Romans, (3)________ , have some similarities to the ones we read now. Until the middle of the 15th century, in Europe, all books were written by hand. They (4)________ often beautifully illustrated and always rare and expensive. With printing came the possibility of cheap, large publication and distribution of book making (5) ________ more widespread and reliable.
(5)..........................

Many of the most damaging and life-threaling types of weather-torrential rains, severe thunderstorms, and tornadoes-begin quickly, strike suddenly, and dissipate rapidly, devastating small regions while leaving neighboring areas untouched. One such event, a tornado, struck the northeastern section of Edmonton, Alberta, in July 1987. Total damages from the tornado exceeded $250 million, the highest ever for any Canadian storm. Conventional computer models of the atmosphere have limited value in predicting short-live local storms like the Edmonton tornado, because the available weather data are generally not detailed enough to allow computers to discern the subtle atmospheric changes that precede these storms. In most nations, for example, weather balloon observations are taken just once every twelve hours at locations typically separated by hundreds of miles. With such limited data, conventional forecasting models do a much better job predicting general weather conditions over large regions than they do forecasting specific local events.
Until recently, the observation-intensive approach needed for accurate, very short range forecasts, or “Nowcasts”, was not feasible. The cost of equipping and operating many thousands of conventional weather stations was prohibitively high, and the difficulties involved in rapidly collecting and processing the raw weather data from such a network were insurmountable. Fortunately, scientific and technological advances have overcome most of these problems. Radar systems, automated weather instruments, and satellites are all capable of making detailed, nearly continuous observation over large regions at a relatively low cost. Communications satellites can transmit data around the world cheaply and instantaneously, and modern computers can quickly compile and analyzing this large volume of weather information. Meteorologists and computer scientists now work together to design computer programs and video equipment capable of transforming raw weather data into words, symbols, and vivid graphic displays that forecasters can interpret easily and quickly. As meteorologists have begun using these new technologies in weather forecasting offices, Nowcasting is becoming a reality.

Why does the author state that observations are taken “just once every twelve hours”?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

   Telecommuting is a form of computer communication between employees’ homes and offices. For employees whose jobs involve sitting at a terminal or word processor entering data or typing reports, the location of the computer is of no consequence. If the machine can communicate over telephone lines, when the work is completed, employees can dial the office computer and transmit the material to their employers. A recent survey in USA Today estimates that there are approximately 8,7 million telecommuters. But although the numbers are rising annually, the trend does not appear to be as significant as predicted when Business Week published “The Portable

   Executive” as its cover story a few years ago. Why hasn’t telecommuting become more popular ?

   Clearly, change simply takes time. But in addition, there has been active resistance on the part of many managers. These executives claim that supervising the telecommuters in a large work force scattered across the country would be too difficult, or, at least, systems for managing them are not yet developed, thereby complicating the manager’s responsibilities.

   It is also true that employees who are given the option of telecommuting are reluctant to accept the opportunity. Most people feel that they need regular interaction with a group, and many are concerned that they will not have the same consideration for advancement if they are not more visible in the office setting. Some people feel that even when a space in their homes is set aside as a work area, they never really get away from the office.

The phrase “of no consequence” means ___________.

Fill in each numbered blank with one suitable word or phrase.

If you want to prepare yourself for great achievement and have more to (1) ______ to your education or your work, try reading more books. (2) ______ up some of the interestingly informative books and search for well-researched material that can help you grow. We should (3) ______ our children to read more books and (4) ______ less time watching TV. Some people have commented that this is inconsistent. "Why is the written word a superior way to get information than television?" That is (5) ______ interesting point of view worth further (6) ______. Reading is a skill that is in much greater demand than the demand for watching TV. There are no jobs that (7) ______ a person to be able to watch TV but reading is an integral part of many jobs. The written word is an incredibly flexible and efficient way of communication. You can write something down and, in no time, it can be (8) ______ to many different people. Not only that, we can (9) ______ vast amounts of information through reading in a very short time. A good reader can acquire more information in reading for two hours than someone watching TV can acquire in a full day. You are able to gain a lot of information quickly because you are a fast reader with good (10) ______ skills. It will save you massive amounts of time and you will be able to assimilate vast quantities of information.

(4) ______

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

I’m standing on a sidewalk in the early morning. The great avenues of Paris are silent, and the shops are closed. Suddenly, a couple appeared from a hole in the sidewalk. Mud covers their boots. They place the iron cover over the hole and run down the street, smiling. The couple had been exploring the tunnels beneath the city.

When Romans occupied Paris, they cut down stone from deep within the earth to build their city. Later, the French used more stone to construct the Notre Dame Cathedral. This left huge underground tunnels upon which part of the city now. Once used for growing mushrooms and as a hiding place, today they are mostly forgotten, except by "cataphiles" - those who love to go down into the tunnels below Paris, even though it is actually not permitted.

In the 70s and 80s, it is easier to enter the tunnels because there were many more open entrances through forgotten doorways and into catacombs - rooms filled with bones. The bones had been moved into the tunnels to solve the problem crowded cemeteries. By the end of the 1980s, most of the entrances were shut and police regularly walked the tunnels. However, there are still cataphiles, like the couple I saw that morning, and for those who dare, the underground is an exciting place to meet, party, perform for each other or create art.

My own experience began beneath the old Paris opera house, where sewer workers showed me a 55-meter-long underground pond, a pond that actually had fish in it! Later, at France's national bank, officials guided me below to an amazing room filled with 2,600 tons of gold.

As cataphiles are the best guides, I then asked one of the cataphiles to give me a tour. Descending into the underground through a secret entrance beneath a bridge, we walked for hours through catacombs, and galleries of huge, bright paintings. The cataphile told me "Many people come down here to party, some to paint. Some people to destroy or to create or to explore. We do what we want, We don't have rules..."

(Adapted from Reading Explorer 2, Paul Macintyre&David Bohlke, 2015)

What is the reading mainly about?

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 from 1 to 5.
Hospitality
Hospitality - looking after visitors - is universal but in different cultures hostsare (1)       to receive guests in different ways.
In much of the ancient world it was the custom to provide passing travellers with food and water. Today some old customs have (2)      . In a traditional Japanese household, if a guest admires a particular object in the house, the host will want to give it to the guest straight away. And in parts of Russia guests are greeted with bread and salt on a special cloth.The guest is (3)        to kiss them and hand them back to the host. Sometimes the guest breaks off a small piece of bread, dips it in the salt and eats it.
In some countries, when foreign guests arrive from abroad, they may feel they have been given a particularly (4)        meal. But this is probably because the host politely offers more and more food and drink and the guest is too embarrassed to (5)      anything down.
(5)....................

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage:

"Many parents believe that they should begin to teach their children to read when they are (1)….. more than toddlers. This is fine if the child shows a real interest but (2)…… a child could be counter-productive if he isn’t ready. Wise parents will have a (3)….. attitude and take the lead from their child. What they should provide is a selection of (4)….. toys, books and other activities. Nowadays there is a plenty of good (5)….. available for young children, and of course, seeing plenty of books in use about the house will also (6)…..  them to read.
 Of course, books are no longer the only (7)….. of stories and information. There Js also a huge range of videos, which can (8)…. And extend the pleasure a child finds in a book and are (9)… valuable in helping to increase vocabulary and concentration. Television gets a bad (10)…. as far as children are concerned, mainly because too many children spend too much time watching programmes not intended for their age group."

5. Nowadays there is a plenty of good (5)….. available for young children, 

Read the text below and decide which answer (A,B,C, or D) best fits each space.
Statesmen define a family as ―a group of indivi duals having a commo n  dwelling andrelated by blood, adoption or marriage, (1) includes common law relationships.‖ Most people are born into one of these groups and (2) live their lives as a family in such a group.Although the definition of a  family may not change, (3).relationship of people to each other within the family  group changes as society changes. More and more wives are (4) paying jobs,  and, as a result, the roles of husband, wife and children are changing. Today,  men expect to(5) . for pay for about 40 years of their lives, and, in today‘s  marriages(6) . which both spouses have paying jobs, women can expect to  work for about 30 to 35 years of their lives. This mean that man must learn to do  their share of family tasks such as caring for the children and daily (7) chores.  Children, too, especially adolescents, have to (8) with the members od their  family in sharing household tasks. The widespread acceptance of contraception  has meant that having (9) is as matter of choice, not an automatic result of  marriage. Marriage itself has become a choice. As alternatives (10)  common-law relationships and single-parent families have become socially  acceptable, women will become more independent. 

1)...................

Read the text below and decide which answer (A,B,C, or D) best fits each space.
MY FIRST JOB

When I was 19, I (58) …….. out of my university course and ended up getting a job in a local travel agent’s. I’d seen the (59) …….. for the job in local paper. It said they wanted someone with a nice (60) …….. and a friendly (61) …….. .I thought the job might be an (62) …….. to send people to interesting places and to see some of the world myself. (63) …….. , it turned out to be a bit of a joke. I arrived at work on the first day with a positive (64) …….., ready to work and learn about new places. I spent that morning and every morning for the first three months filling (65)…….. forms and making coffee for the rest of the staff. (66) …….. I was hoping to be dealing with travel-hungry people with a good idea of where they wanted to go, the (67) …….. customer took ages to make their mind (68) …….. . It was amazing the number  of  customers  who  would  spend  ages  finding  the  perfect  destination  only  to have a change (69) …….. heart at the last moment. If we did organize the trip of a lifetime for someone, we rarely got thanks (70) …….. all our efforts. I now work in publishing (71) …….. a living, so these days I’m a customer in travel agencies. One thing I always keep (72) …….. mind is the need to say thank you.

68......................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

The concept of traffic-free shopping areas goes back a long time. During the Middle Ages, traffic-tree shopping areas were built in Middle Eastern countries to allow people to shop in comfort and, more importantly, safety. As far back as 2000 years ago, road traffic was banned from central Rome during the day to allow for the free movement of pedestrians.

The modern, traffic-free shopping street was born in Europe in the 1960s, when both city population and car ownership increased rapidly. Dirty exhaust from cars and the risks involved in crossing the road were beginning to make shopping an unpleasant and dangerous experience. Many believed the time was right experimenting with car-free streets, and shopping areas seemed the best place to start.

At first, there was resistance from shopkeepers. They argued that people would avoid streets if they unable to get to them in their cars. When the first streets in Europe were closed to traffic, there were noisy demonstrations, as many shopkeepers predicted they would lose customers.

With the arrival of the traffic-free shopping street, many shops, especially those selling things clothes, food and smaller luxury items, prospered. Unfortunately, shops selling furniture and larger electrical appliances actually saw their sales drop. Many of these were forced to move elsewhere, away from centre.

(Adapted from Complete IELTS)

According to paragraph 2, shopping became an unpleasant and unsafe experience due to pollution and ______.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

   Mickey Mantle was one of the greatest baseball players of all time. He played for the New York Yankees in their years of glory. From the time Mantle began to play professionally in 1951 to his last year in 1968, baseball was the most popular game in the United States. For many people, Mantle symbolized the hope, prosperity, and confidence of America at that time.

   Mantle was a fast and powerful player, a “switch-hitter” who could bat both right-handed and lefthanded. He won game after game, one World Series championship after another, for his team. He was a wonderful athlete, but this alone cannot explain America’s fascination with him.

   Perhaps it was because he was a handsome, red-haired country boy, the son of a poor miner from Oklahoma. His career, from the lead mines of the West to the heights of success and fame, was a fairy-tale version of the American dream. Or perhaps it was because America always loves a “natural”: a person who wins without seeming to try, whose talent appears to come from an inner grace. That was Mickey Mantle.

   But like many celebrities, Mickey Mantle had a private life that was full of problems. He played without complaint despite constant pain from injuries. He lived to fulfill his father’s dreams and drank to forget his father’s early death.

   It was a terrible addiction that finally destroyed his body. It gave him cirrhosis of the liver and accelerated the advance of liver cancer. Even when Mickey Mantle had turned away from his old life and warned young people not to follow his example, the destructive process could not be stopped. Despite a liver transplant operation that had all those who loved and admired him hoping for a recovery, Mickey Mantle died of cancer at the age of 63.

Which of the following is mentioned as the main cause of the destruction of Mantle’s body?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

   Marianne Moore (1887-1972) once said that her writing could be called poetry only because there was no other name for it. Indeed her poems appear to be extremely compressed essays that happen to be printed in jagged lines on the page. Her subjects were varied: animals, laborers, artists, and the craft of poetry. From her general reading came quotations that she found striking or insightful. She included these in her poems, scrupulously enclosed in quotation marks, and sometimes identified in footnotes. Of this practice, she wrote, "Why many quotation marks?" I am asked ... When a thing has been so well that it could not be said better, why paraphrase it? Hence, my writing is, if not a cabinet of fossils, a kind of collection of flies in amber." Close observation and concentration on detail and the methods of her poetry.

   Marianne Moore grew up in Kirkwood, Missouri, near St. Lois. After graduation from Bryn Mawr College in 1909, she taught commercial subjects at the Indian School in Carlisle, Pennsylvania. Later she became a librarian in New York City. During the 1920’s she was editor of

   The Dial, an important literary magazine of the period. She lived quietly all her life, mostly in Brooklyn, New York. She spent a lot of time at the Bronx Zoo, fascinated by animals. Her admiration of the Brooklyn Dodgers-before the team moved to Los Angeles-was widely known.

   Her first book of poems was published in London in 1921 by a group of friends associated with the Imagist movement. From that time on her poetry has been read with interest by succeeding generations of poets and readers. In 1952 she was awarded the Pulitzer Prize for her Collected Poems. She wrote that she did not write poetry for money or fame. To earn a living is needful, but it can be done in routine ways. One writes because one has a burning desire to objectify what it is indispensable to one's happiness to express.

The author mentions all of the following as jobs held by Moore EXCEPT ________

In “Cerealizing America”, Scott Bruce and Bill Crawford remark that the cereal  industry uses 816 million pounds of sugar per year. Americans buy 2.7 billion  packages of breakfast cereal each year. If (1) _______ end to end, the empty  cereal boxes from one year's consumption would (2) _______ to the moon and back. One point three (1.3) million advertisements for cereal are broadcast on  American television every year at a(n) (3) _______ of $762 million for airtime.  Only automobile manufacturers spend more money on television advertising  than the makers of breakfast cereal. (4) _______ of the boxed cereals found in  supermarkets contain large amounts of sugar and some contain more than 50%  sugar. Cereal manufacturers are very clever in their marketing, making many  cereals appear much healthier than they really are by “fortifying” them with vitamins and minerals. Oh, (5) ______ – you now have vitamin-fortified sugar! Before you eat any cereal, read the ingredient list and see how (6) _______  sugar appears on the ingredient list. Then check the “Nutrition facts” panel. 
There are actually only a small handful of national commercially-branded cereals  that are made (7) _______ whole grains and are sugar-free. If you shop at a health  food store instead of your local supermarket, you (8) _______ to find a healthy,  whole grain, sugar-free (or very low sugar) cereal. But (9) _______! Some of the  health food store boxed cereals are sweetened with fruit juice or fructose.  Although this may be an improvement (10) _______ refined white sugar, this can  really skyrocket the calories. 

8.....................

Read the text below and decide which answer (A,B,C, or D) best fits each space.
Tattooing is an old art. In ancient Greece, people who had tattoos were regarded  asmembers of the (16)____classes. On the other hand, tattooing was  (17)_____in Europe by the early Christians, who thought that it was a sinful  thing to(18) .It was not until the late 18th century, when Captain Cook  saw South Sea Islander decorating their bodies with tattoos that attitudes began  to change. Sailors came back from these islands with pictures of Christ on their  backs and from then on, tattooing (19)_____in popularity. A survey by the  French army in 1881 (20)_____that among the 387 men (21)_______ there were  1,333 designs. Nowadays, not everybody finds tattoos acceptable. Some people  thing that getting one is silly because tattoos are more or less permanent. There  is also some (22)_____about (23)_____ a blood disease from unsterilized needles. Even for those who do want a tattoo, the (24)_____of getting one is not  painless, but the final result, in their eyes, is (25)______the pain. 

17....................

Read the following passage and mark A, B, C, or D to indicate the correct answer to each  of the blanks.

Modern industry pollutes, and it also seem to cause significant changes to the climate. What is needed is an industry that (41)_________ the benefits without the costs. And the glimmerings of such an industry can now be (42)_________ .
That industry is based on biotechnology. At the moment, biotech‟s main uses are in medicine and agriculture.  However,  its  biggest  long  term impact maybe industrial.  Biotechnology will  (43)_________ demand for oil by taking the cheapest raw materials imaginable, carbon dioxide and water, and using them to make fuel and plastics.
Plastics and fuels made in this way would have several advantages. They can be called “renewable”, (44)_________ nothing is depleted to make them. They would be part of the natural carbon cycle, borrowing    that element from the atmosphere for a few months, and returning it when they were burned or (45)_________ . That means they could not possibly contribute to global warming. They would also be environmentally friendly in other ways.
All in all, the future could be green in ways that traditional environmentalists had not expected.
(45)........................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

Machines already perform a lot of tasks that were usually done by humans, such as building cars, doing complex calculations, and even marking exam papers. But now it seems that ever more intelligent machines are straying into areas where we never envisaged they would go. We have always taken pride in having a unique kind of intelligence that machines could never match, one which allows us to think of new ideas and produce creative and artistic works. But it seems that even here, computers are lining up to compete with us.

Machines can easily be trained to do the physical work of producing art. About ten years ago, a painting robot known as e-David was created at a university in Germany. And recently in New York, the painting ‘Portrait of Edmond de Belamy' has been auctioned for nearly half a million dollars. What made it a bit unusual was that the idea, and the image itself, was produced entirely by a computer. A group of young French artists gave instructions to the computer, aiming simply to show that computers can be creative.

Some artists are now working with computers to produce a new kind of art. Computer-generated works of art are certainly interesting, and make us think about the limits of what machines can and cannot do. But not everyone would accept that they qualify as art. Some enthusiasts would argue they do, and the collectors willing to pay high prices for these works would suggest there is definitely a market for computer art. Others, however, would disagree.

Many 'real' artists would claim that art is an expression of human intelligence and human emotions. More importantly, it is about a desire to communicate with other people. These things, they argue, are part of being human and can never be produced by a machine.

(Adapted from Formula-Exam Trainer)

The word envisaged in paragraph 1 is closest in meaning to ______.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

As Australia's largest and oldest city, Sydney carries many traces of its history. Time seems to stand still in the city's old streets and in its many magnificent, ancient buildings, such as the Sydney Town Hall, the Queen Victoria Building, and St. Mary's Cathedral. To explore the city's present and past, head for The Rocks the oldest neighbourhood in Australia and Sydney, where sandstone houses built in the 18th century still stand. You can stroll through the pretty streets, visit a traditional pub for some craft beer, and try delicious local dishes.

Sydney is blessed with natural gifts that few cities can rival. This city is full of greenery. Parks and nature reserves mingle with urban areas. Thanks to this, you need not travel far to see rare species in numerous city zoos; or enjoy fresh air and a range of plants from all corners of the world, all gathered in boundless parks. For those visitors keen to explore the sea, Sydney is heaven with over 70 spectacular bays and beaches. These include beautiful Bondi Beach, which is said to be the loveliest on the planet, where visitors can sunbathe, and play various water sports.

Sydney is said to be a miniature world of attractions, captivating visitors. It is a must-go destination on every tourist's bucket list, should they visit the beautiful land of Australia.

(Adapted from Heritage)

The word “These” in paragraph 2 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 from 36 to 40.
Vietnamese generally shake hands when greeting and parting. Using both hands shows respect as does a (36)_________ bow of the head. In rural areas, elderly people who do not extend their hand are greeted with a slight bow. Women are more likely to bow the head than to shake hands. Vietnamese names begin with the family name andare (37)_________ by a given name. People address one another by their given names,    but add a title that indicates their perceived relationship to the other person. These titles are family related rather than professional. Among colleagues, for example, the younger of the two might combine the given name with the title of - Anh(OlderBrother). A/n (38)_________ greeting combined with the given name and titleis “Xin chao” (Hello). Classifiers for gender and familiarity are also combined with the greeting. In formal meetings, business cards are sometimes exchanged on greeting.
Vietnamese have astrong (39)_________ of hospitality and feel embarrassed if they cannot show their guests  full respect by preparing for their arrival. Therefore, it is (40)_________ to visit someone without having been invited. Gifts are not required, but are appreciated. Flowers, incense, or tea may be appropriate gifts for the hosts. Hosts also appreciate a small gift for their children or elderly parents.
(38).................

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

Machines already perform a lot of tasks that were usually done by humans, such as building cars, doing complex calculations, and even marking exam papers. But now it seems that ever more intelligent machines are straying into areas where we never envisaged they would go. We have always taken pride in having a unique kind of intelligence that machines could never match, one which allows us to think of new ideas and produce creative and artistic works. But it seems that even here, computers are lining up to compete with us.

Machines can easily be trained to do the physical work of producing art. About ten years ago, a painting robot known as e-David was created at a university in Germany. And recently in New York, the painting ‘Portrait of Edmond de Belamy' has been auctioned for nearly half a million dollars. What made it a bit unusual was that the idea, and the image itself, was produced entirely by a computer. A group of young French artists gave instructions to the computer, aiming simply to show that computers can be creative.

Some artists are now working with computers to produce a new kind of art. Computer-generated works of art are certainly interesting, and make us think about the limits of what machines can and cannot do. But not everyone would accept that they qualify as art. Some enthusiasts would argue they do, and the collectors willing to pay high prices for these works would suggest there is definitely a market for computer art. Others, however, would disagree.

Many 'real' artists would claim that art is an expression of human intelligence and human emotions. More importantly, it is about a desire to communicate with other people. These things, they argue, are part of being human and can never be produced by a machine.

(Adapted from Formula-Exam Trainer)

The word they in paragraph 4 refers to_______

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage: 

"Books are written to provide knowledge and good books enrich the mind. By putting (1)…. under the influence of superior mind, we (2) ….. our mental powers. (3)…. good books, we learn that people everywhere are the (4) ......., in ali ages, and in all (5)…. . This knowledge improves our love (6)…. others and helps us to live in peace with them.
 We also (7)…. that the world was made not only for man (8)…. but for every creature that can feel hunger and thirst, warmth and cold. Though it may be possible for us to travel (9)…. the world and see the things happening today, it is not possible for us to see the things that happened in the past. But good books (10) …..us to see not only into the most remote regions of the world today, but also into the world in which our ancestors lived."

7.  We also (7)…. that the world was made not only for man

Read the passage below and choose one correct answer for each question.

Books which give instructions on how to do things are very popular in the United States today. Thousands of these How-to books are useful: in fact, there are about four thousand books with titles that begin with the words 'How-to". One book may tell you how to earn more money, another may tell you how to save or spend it and another may explain how to give your money away. Many How-to books give advice on careers. They tell you how to choose a career and how to succeed in it. If you fail, however, you can buy the book “How to Turn Failure into Success”. If you would like to become very rich, you can buy the book “How to Make a Millionaire”. If you never make any money at all. you may need abook called “How to Live on Nothing”. One of the most popular types of books is one that helps you with personal problems. If you want to have a better love of life, you can read “How to Succeed in Love Every Minute of Your Life”. If you are tired of books on happiness,  you may prefer books which give step-by-step instructions on how to redecorate or enlarge a house. Why have How-to books become so popular? Probably because life has become so complex. Today people have far more time to use, more choices to make, and more problems to solve. How-to books help people deal with modern life.

The passage tells us that How-to books sell well on how________