Choose the best answer:
Robots in factories will be able to do everything the workers do, __________ robots will make them jobless.

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks. 
In European and North American cultures, body language behaviors can be divided into 2 groups: open or closed and forward or backward.
Open/closed postures are the easiest to (21).............. . People are open to messages when they show open hands, face you fully, and have both feet on the ground. This indicates that they are (22)............... to listen to what  you are saying, even if they are disagreeing with you. When people are closed to messages, they have their arms folded or their legs crossed, and they may turn their bodies away. This body language usually means that people are rejecting your message.
Forward or backward behavior reveals an active or a passive (23)...... to what is being said. If people lean forward with their bodies toward you, they are actively engaged in your message. They may be accepting or rejecting it, but their minds are on (24).................you are saying. On the other hand, if people lean back in their chairs or look away from you, or perform activities such as drawing or cleaning their eyeglasses, you know that they are either passively taking in your message or that they are ignoring it. In (25).............case, they are not very much engaged in the conversation.

(21)..........................

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:
She wants to be a singer; you think she should go for a long–term career with job security and eventually retire with a good pension. But a new report suggests that in fact she’s the practical one. Why do parents make terrible career advisers?
Today’s 14 and 15–year–olds are ambitious. They are optimistic about their prospects, but their career ideas are rather vague. Although 80% of them have no intention of following in their parents’ footsteps, 69% still turn to their parents for advice. They look at their working future in a different way to their parents.
A job for life is not in their vocabulary; neither is a dead–end but secure job that is boring but pays the bills. Almost half the boys surveyed expected that their hobbies would lead them into the right sort of job, while most girls seemed determined to avoid traditionally female careers such as nursing.
In the past, this might have counted as bad news. Certainly when I was 15, my guidance counsellors were horrified at my plans to become a writer. I’m glad I didn’t change my plans to suit them. Even so, their faith in rigid career paths was well–founded. In those days, that was the way to get ahead.
But the world has changed. The global economy is not kind to yesterday’s diligent and dependable worker. The future belongs to quick–thinking people who are resourceful, ambitious and can take the initiative. This means that a 14–year–old who sees her working future as a kind of adventure, to be made up as she goes along is not necessarily being unrealistic.
However, she has to have the training and guidance to help her develop the right skills for today’s market; not the rigid preparation for a workplace that disappeared twenty years ago. Many young people are very aware of the pitfalls of the flexible workplace; they understand that redundancy, downsizing and freelancing are all part of modern working life, but no one is telling them how they might be able to turn the new rules of the employment game to their advantage. This is what they need to know if they are to make a life for themselves.

So what is to be done? A good first step would be to change the way in which schools prepare young people for adult life. The education system is becoming less flexible and more obsessed with traditional skills at just the time that the employment market is going in the opposite direction.
Accurate, up–to–date information on new jobs and qualifications can help guidance counsellors to help their students. Young people need solid information on the sort of training they need to pursue the career of their dreams. Also, a little bit of encouragement can go a long way. If nothing else, a bit of optimism from an adult can serve as an antidote to the constant criticism of teenagers in the press.
What, then, can we as parents do to help them? The best thing is to forget all the advice that your parents gave you, and step into your teenager’s shoes. Once you’ve done that, it’s easier to see how important it is that they learn how to be independent, resourceful and resilient. Give them the courage to follow their dreams –however odd they might sound right now. In a world that offers economic security to almost no one, imagination is a terrible thing to waste.

What does the writer feel will happen if the education system does not change?

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
There has been an outbreak of avian influenza, better known as bird flu in Asia recently. The first (1)............ died two weeks ago in Vietnam and there have been the cases reported since in Thailand, and there are some suspected cases in Cambodia as well as.
Wild birds are affected by a large number of flu viruses, just as the humans and other animals are, but they are normally exclusive to birds. If the viruses manage to mutate, they can to jump the species barrier and infect human beings. The first case (2)......... someone died was in Hong Kong in 1997.
There are the several different forms of bird flu, ranging from mild to very (3).............. infections, which spreading rapidly and kill many of the birds they infect. It is spread by wild birds-ducks, in particular – which carry the virus, but aren't killed by it. They can spread the virus to farm birds through (4).............contact or by the contaminating water supplies.
World Health Organization officials have attributed the spread of bird flu to human contact with the droppings of infected birds and (5)........... sanitation. There was no evidence at first that the virus spread from person to person, though there has been a case of this happening being investigated by scientists.

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

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:
Most forms of property are concrete and tangible, such as houses, cars, furniture or anything else that is included in one’s possessions. Other forms of property can be intangible and copyright deals with intangible forms of property. Copyright is a legal protection extended to authors of creative works, for example, books, magazine articles, maps, films, plays, television shows, software, paintings, photographs, music, choreography in dance and all other forms of intellectual or artistic property.
Although the purpose of artistic property is usually public use and enjoyment, copyright establishes the ownership of the creator. When a person buys a copyrighted magazine, it belongs to this individual as a tangible object. However, the authors of the magazine articles own the research and the writing that went into creating the articles. The right to make and sell or give away copies of books or articles belongs to the authors, publishers, or other individuals or organizations that hold the copyright. To copy an entire book or a part of it, permission must be received from the copyright owner, who will most likely expect to be paid.
Copyright law distinguishes between different types of intellectual property. Music may be played by anyone after it is published. However, if it is performed for profit, the performers need to pay a fee, called a royalty. A similar principle applies to performances of songs and plays. On the other hand, names, ideas, and book titles are accepted. Ideas do not become copyrighted property until they are published in a book, a painting or a musical work. Almost all artistic work created before the 20th century is not copyrighted because it was created before the copyright law was passed.
The two common ways of infringing upon the copyright are plagiarism and piracy. Plagiarizing the work of another person means passing it off as one’s own. The word plagiarism is derived from the Latin plagiarus, which means “abductor”. Piracy may be an act of one person, but, in many cases, it is a joint effort of several people who reproduce copyrighted material and sell it for profit without paying royalties to the creator. Technological innovations have made piracy easy and anyone can duplicate a motion picture on videotape, a computer program, or a book. Video cassette recorders can be used by practically anyone to copy movies and television programs, and copying software has become almost 'as easy as copying a book. Large companies zealously monitor their copyrights for slogans, advertisements, and brand names, protected by a trademark.

The word “principle” in paragraph 3 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:
Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants.
The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only  minuscule amounts in his excreta and through evaporation from his respiratory tract.
Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period. This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

The word “parsimony” 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 word or phrase that best fits each of the numbered blanks
Parents and teachers are always making (1)......... between the time when they were children and the present generation . They say everything was better than it is today, especially in education. (2)........ , they say they used to work much harder in school, and that nowadays, we aren’t very interested. I disagree, because we spend hours every day doing homework after our lessons or (3)........... for exammination. I wonder (4)..........our parents really had to study so much after school every day. In my opinion, it is no exaggeration to say we have forgotten how to play. I think one reason why kids (5)........... in class is because they need to get rid of stress.

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

As many of you have noticed, the main entrance of our building is in ---131--- condition. It is in desperate need of attention. Therefore, beginning at 6 P.M. on Friday, the main entrance ---132--- for approximately one month as it is renovated. The changes will give the entryway a more streamlined and contemporary appearance.
---133--- the main entrance is closed, employees and visitors may use the side entrances to gain access to the building. 134---.

132...................

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
               School lunch
Research has shown that over half the childrn in Britain who take their own lunches to school do not eat (1) .......in the middle of the day. In Britain, schools have to (2)...... meals at lunchtime. Children can choose to bring their own food or have lunch at the school canteen.
One shocking finding of the research is that school meals are much healthier than lunches prepared by parents. There are strict (3)..... _ for the preparation of school meals, which have to include one (4)............of fruit and one of vegetables, as well as meat, a dairy item and starchy food like break or pasta. Lunchboxes examined by researchers contained sweet drinks, crisps and chocolate bars. Children consume twice as much sugar as they should at lunchtime.
The research will provide a better understanding (5)......... why the percentage of overweight in Britain has increased in the last decade. Unfortunately, the government can’t criticize parents, but it can remind them of the nutritional value of milk, fruit and vegetables. Small changes in their children’s diet can affect their future health. Children can easily develop bad eating habits at this age, and parents are the only ones who can prevent it.
(1).................

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:
Less than a year ago marketing director, David Smith, 33 was behaving like a secet agent. He used to secretly taped all his conversations, he refused to sign his name and he would ask his secretary to check all his emails. Anything he wrote was photocopied and kept as “evidence”. But David isn’t mad, or even mildly eccertric. He suffers from ‘resposibility OCD’, one of more common form of obsessive compulsive disorder, or OCD, as it is usually known.
OCD is now recognized as the second most prevalent mental-health problem, after depression – and the number of reported cases is soaring. Experts estimate that 2% - 3% of the population suffer from the full-blown syndrome, with as many as one in five suffering from a milder form.
OCD sufferers are tortured by obsessional thoughts, such as worrying that their hands are contaminated by germs. The terrible anxiety is only relieved by performing a particular set of behaviours. Unfortunately, any sense of relief is short-lived, which is why the behaviour must be repeated again and again. OCD sufferers know their behavior is irrational, yet feel powerless to stop.
Common treatments are either antidepressants or behavioral therapy with a psychologist, but only 60% of patients show some improvement. However, a new treatment from America is bringing fresh hope to sufferers.
One of the OCD gurus and neuropsychiatrists, Jeffrey Schwartz, has designed the Four Steps program which employs meditation teachniques with the aim of teaching sufferers to manage their symptoms by themselves. “The goal is to learn to override false brain messages”, explains Schwartz.
There are different theories about what causes the disorder. Most experts recognize a genetic element that can be triggered by a stressful event. Schwartz believes that the OCD ‘worry circuit’ is a
direct result of faulty brain chemistry. ‘When someone experiences an OCD thought, one part of the brain knows quite clearly that the hand are not dirty’, explains Schwartz ‘Some part of the brain is standing apart from the symptoms, reflecting on the sheer bizarreness of it all. The objective is to harness this impartial spectator so that patients can use this healthy part of their brain to resist the compulsions.’
David Smith is delighted with the results of Schwartz’s treatment. ‘Now I can sign cheques without a problem’, he says brightly. ‘And I don’t photocopy them either. OCD used to feel like a huge stigma, but I don’t feel handicapped by it any more. You just deal with it.’

Why do OCD sufferers repeatedly perform the same action?

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.
                   Why read books?
Is it worth reading books, (16)........ nowadays there are so many other forms  of entertainment? Some people say that even paperback books are expensive, and not everyone can borrow books from a library. They might add that television is more exciting and that viewers can relax as they watch their favourite (17)........... . All that may be true, but books are still very popular. They encourage the reader to use his or her imagination for a start. You can read a chapter of a book, or just a few pages, and then stop. Of course, it may be so (18).......... _ that you can’t stop!  There are many different kinds of books, so you can choose a crime novel or an autobiography, or a book (19).........gives you interesting information. If you find it hard to choose, you can read  reviews, or ask friends for ideas. Personally, I can’t do without books, but I can (20)............. up television easily enough. You can’t watch television at bus stops!
(19)...................................

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:
Did you ever watch a video on the Internet? Maybe you used YouTube. YouTube is a Website where people can share their video. Today, YouTube is an important part of the Internet. However, that wasn’t always true.
YouTube started with a young man named Jawed Karim and two friends. One day, Karim was on the Internet. He wanted information about the 2004 tsunami in Southeast Asia. He found news stories about it, but he couldn't find any videos. This gave Karin an idea. He wanted to help people put video on the Internet. Karim told his friends about this idea. Together, they created a company - YouTube.
YouTube become a global success. Millions of people around the world Visited the Website. It was clear to Google, another Internet company, that YouTube had a lot of value. Google made a deal. It bought YouTube for $1.65 billion. As a result, YouTube investors and its employees made a lot of money. The three friends who started YouTube were very big investors. Therefore, they made an enormous amount of money.
Karim became very rich, and he continued to work toward his PhD. There was something else he wanted to do. He wanted to help young people go into business. He used money and experience to start a new company called Youniversity Ventures. This company helps young people who have good business ideas. It gives them advice and money to start Internet businesses. Milo is one business that students started with the help of Youniversity Ventures.
Milo is a shopping Website. It helps people find products in stores near their homes. Another example is AirBoB. This Web site helps people find for video conferences. People in different places can use this site to have business meetings.
Karim has some advice for students who want to start business. First, find a successful company. Do a lot of research about the company and the top people in the company. There, copy the way they do things. For students who wants to start Interner business, Karim is probably a very good example to copy. 

What does the word “This” 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 or phrases that best fits each of the numbered blanks.
It was a Monday morning in the office and, as usual, everyone was busy sorting through their mail before starting work. The other staff had (1)........... that Nicky , one of the computer operators, had been (2)......... rather miserable recently and they wondered what  might  have been happened to  make her so (3)........ . Suddenly Nicky accidentally knocked over a cup of coffee. As she was clearing up the mess, the girl sitting next to her happened to glance at Nicky's right hand. There was a large swelling at the wrist. "What on earth have you (4)........  to yourself? Does it hurt?"  asked the girl. " Yes, it does. I think I've injured it using the computer", replied Nicky. " I think you'd better go and let the doctor (5)............  it", said the girl. " Let's hope there's no permanent  damage to your hand" .

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

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:
Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water, soil, radioactive, noise, heat/ thermal and light Let us discuss the causes and effects of air pollution on mankind and the environment as a whole.
Air pollution is the most prominent and dangerous form of pollution. It occurs due to many reasons. Excessive burning of fuel which is a necessity of our daily lives for cooking, driving and other industrial activities; releases a huge amount of chemical substances in the air every day; these pollute the air. Smoke from chimneys, factories, vehicles or burning of wood basically occurs due to coal burning; this releases sulphur dioxide into the air making it toxic.
The effects of air pollution are evident too. The increase in the amount of CO2 in the atmosphere leads to smog which can restrict sunlight from reaching the earth. Thus, preventing plants in the process of photosynthesis. Gases like sulfur dioxide (SO2) and nitrogen oxide (NO) can cause acid rain.
The decrease in quality of air leads to several respiratory problems including asthma or lung cancer. Chest pain, congestion, throat inflammation, cardiovascular disease, respiratory disease are some of diseases that can be caused by air pollution.
The emission of greenhouse gases particularly CO2 is leading to global warming. Every other day new industries are being set up, new vehicles come on roads and trees are cut to make way for new homes. All of them, in direct or indirect way lead to increase in CO2 in the environment. The increase in CO2 leads to melting of polar ice caps which increases the sea level and pose danger for the people living near coastal areas.
Ozone layer is the thin shield high up in the sky that stops ultra violet rays from reaching the  earth. As a result of human activities, chemicals, such as chlorofluorocarbons (CFCs), were released into the atmosphere which contributed to the depletion of ozone layer.

According to paragraph 5, air pollution contributes to the greenhouse effect which can lead 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:
In 1900 the United States had only three cities with more than a million residents-New York, Chicago, and Philadelphia. By 1930, it had ten giant metropolises. The newer ones experienced remarkable growth, which reflected basic changes in the economy. The population of Los Angeles (114,000 in 1900) rose spectacularly in the early decades of the twentieth century, increasing a dramatic 1,400 percent from 1900 to 1930.
A number of circumstances contributed to the meteoric rise of Los Angeles. The agricultural potential of the area was enormous if water for irrigation could be found, and the city founders had the vision and dating to obtain it by constructing a 225-mile aqueduct, completed in 1913, to tap the water of the Owens River. The city had a superb natural harbor, as well as excellent rail connections. The climate made it possible to shoot motion pictures year-round; hence Hollywood not only supplied jobs but also disseminated an image of the good life in Southern California on screens all across the nation. The most important single industry powering the growth of Los Angeles, however, was directly linked to the automobile. The demand for petroleum to fuel gasoline engines led to the opening of the Southern California oil fields, and made Los Angeles North America’s greatest refining center.
Los Angeles was a product of the auto age in another sense as well: its distinctive spatial organization depended on widespread private ownership of automobiles. Los Angeles was a decentralized metropolis, sprawling across the desert landscape over an area of400 square miles.
It was a city without a real center. The downtown business district did not grow apace with the city as a whole, and the rapid transit system designed to link the center with outlying areas withered away from disuse. Approximately 800,000 cars were registered in Los Angeles County in 1930, one per 2.7 residents. Some visitors from the east coast were dismayed at the endless urban sprawl and dismissed Los Angeles as a mere collection of suburbs in search of a city. But the freedom and mobility of a city built on wheels attracted floods of migrants to the city.

According to the passage, the most important factor in the development of agriculture around Los Angeles was the     .

Choose the best answer:
I think the light bulb the most important ____________.

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 diary and the letter were the most extensively practiced forms of life writings in eighteenth- century America. From the numerous examples of these two types of writing from the period, a portrait of daily life of the period can be gleaned.
Many of the diaries that were kept during this period were life diaries by authors interested in maintaining day-to-day records of reflective self-examination, but some of the most compelling were situational diaries; those prompted by and limited to lengthy descriptions of personal reflections about a particular event. Three of the many situational journals of this period are those written by Sarah Kemble Knight, William Burd II, and Dr. Alexander Hamilton. Sarah Kemble Knight's diary of her five-month trip at the end of 1704 and the beginning of 1705 from Boston to New Haven to New York and back again to Boston was published more than a century later as The Journal of Madam Knight. Though this diary does include an account of the hardship that she encountered along the way, it is principally composed of humorous descriptions of and commentary on the hospitality that she was offered and the manners of those that she encountered. William Burd II kept two diaries to describe his experiences on a 1729 surveying expedition to settle a border dispute between Virginia and North Carolina. One of the diaries, History of the Dividing Line between Virginia and North Carolina, was published in 1842, while its companion, Secret Diary, was published in 1929. In these diaries, Burd used a humorous and satirical approach to describe not just the day-to-day events of the trip but also the characteristics which set his beloved Virginia culture apart from the (in his opinion) decidedly less praiseworthy culture of those non- Virginians that he encountered in his trip. Dr. Alexander Hamilton's Itinerarium (1744) describes a four- month voyage of discovery undertaken by Hamilton through the mid-Atlantic and New England colonies; in the diary that he kept of this trip. Hamilton provides considerable commentary on the social customs of various areas, comparing the customs and culture of the better homes of the American colonies with those of the great salons of Europe.
Letter-writing also held a place of importance in eighteenth-century America (indeed, the ability to produce cultured letters was considered a form of art), and many letters extant from that period provide insights into the culture, mores, and styles of written communication of that era. Many of the letter writers employed devices in common usage in European models of the time, demonstrating that letter writers felt a sense of cohesiveness with the cultured classes of Europe: John and Abigail Adams signed the names Lysander and Constantia to their early letters, while Thomas Jefferson created an elaborate dialogue between his head and his heart to discuss the nature of friendship in  a 1786 letter to Maria Cosway. The variety of purposes that these letters served provides additional insight into the priorities of the society of the time. The letters were used to cement love matches and friendships, as the previously mentioned letters did; they were the primary method for relaying news among family and friends who were scattered across various geographic locations; they were often used as a means of carrying out business in this era before more rapid long-distance communication; they were often used used as a way of sharing professional, social, or political ideas among leaders in various fields who perhaps had no other way to get together and exchange ideas.

The phrase in parentheses (in his opinion) is included in paragraph 2 in order to indicate

A spokesperson for Brenda Amon ---139--- that the pianist made a sizeable donation toward the expansion of the Grenel City Conservatory of Music. "Without her generous  support,"  said  Marc Diaz, director of facility planning, "we would have  been  limited  in  our  renovation  plans  going forward."---140---. Now, a new wing will be constructed on the south end of the ---141--- conservatory. Once completed, the building will boast a 700-seat auditorium, state-of-the-art recording studios, and new faculty and administrative offices. Additionally, private practice rooms will be located---142--- the current student lounge.

142.......................

Choose the letter A, B, C or D to complete the passage below.

"The Internet was born (1) _________scientists attempted to connect the American Defence Network to other satellite networks in (2) _________to exchange information. Soon, scientific and educational institutions as well as research departments became interested (3) _________ linking up, and, before long, the Internet had expanded into an international information and communication network.

The Internet now (4) _________ all the countries in the world. You can be connected to the Internet directly through your own computer or you can hook up to (5) _________ access system which allows you to use some of the Internet’s services."

3.  Soon, scientific and educational institutions as well as research departments became interested (3) _________ linking up,

Mark the letter a, B, C, or D on your answer sheet to choose the best option for each numbered gap to complete the following passage.
Many thousands of children have …. (6).….in their homes. As a result, some children died. The most common accidents are with fire and hot water. Small children often .….(7)…... pots of boiling water on the stove. The pots fall over and the hot water falls on the children and burns them. Some children like to play with fire. They enjoy striking matches or throwing things on a fire to make it burn brightly. If a fire gets too big, it gets out of control. Then the house…...(8)…...... fire. It is very dangerous to play with matches. When a child strikes a match, the flame soon burns near his fingers. Then he….(9)…...... the match on the floor. Many houses catch fire in this way.
Some kinds of clothing burn very…….(10)…......Many children have been badly burned because they have stood too near a fire and their clothing has suddenly caught fire.

(6)............................ 

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:
By adopting a few simple techniques, parents who read to their children can considerably increase their children’s language development. It is surprising, but true. How parents talk to their children makes a big difference in the children’s language development. If a parent encourages the child to actively respond to what the parent is reading, the child’s language skills increase.
A study was done with two or three-year-old children and their parents. Half of the thirty children participants were in the experimental study; the other half acted as the control group. In the experimental group, the parents were given a two-hour training session in which they were taught to ask open-ended questions rather than yes-no questions. For example, the parent should ask, “What is the doggy doing?” rather than, “Is the doggy running away?” Experimental parents were also instructed how to expand on their children’s answer, how to suggest alternative possibilities, and how to praise correct answers.
At the beginning of the study, the children did not differ on levels of language development, but at the end of one month, the children in the experimental group were 5.5 months ahead of the control group on a test of verbal expression and vocabulary. Nine months later, the children in the experimental group still showed an advance of 6 months over the children in the control group.

What was the major difference between the control group and the experimental one in the study?