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:
The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.
Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.
In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective. Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.

The author of the passage states that the amount of acid produced by the bacteria in your saliva increases     .

Read the following passage and choose the best answer (A, B, C, D):
According to Vietnamese legend, (1) ____ giant turtle in Hanoi's Hoan Kiem Lake reclaimed a magic sword given to King Le Loi in the 15th century that he used to win independence (2) ____ China's Ming Dynasty. The lake was thereafter named 'Ho Hoan Kiem', or 'Lake of the Returned Sword', and Hanoi has been built up (3) ____ it. Margie Mason of Associated Press wrote: "(4) ____ once was a magic golden turtle that lived in Hanoi's most enchanted lake. The giant turtle was believed so powerful, it snatched a divine sword from a warrior king and returned it to the gods of the depths nearly six centuries (5) ____. That tale has long been a (6) ____ among young and old Vietnamese living in the capital city, but folklorists soon may have to rewrite the story to (7) ____ a very sad ending. In real life, the last giant soft-shell turtle (8) ____ in Hoan Kiem Lake probably will die alone, and at least one biologist says the species (9) ____ then be extinct. The elusive creature - with a shell as big as a desk - occasionally pokes its wrinkled head out of the murky waters of the downtown lake to (10) ____ a breath, but few Vietnamese are lucky enough to glimpse it. And certainly no one knows its age."

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At break time, I go to the library and …………. books.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
The fictitious androids written about in the mid-1900s are becoming a reality with advances in the field of robotics. Japan and Korea have been pioneers in this field. They regularly compete to be the first. The focus on most reseachers is in (1)............. life-like, attractive female androids. A Japanese research group led by Hiroshi Ishiguro created ther world’s first female android, which is called Actroid in 2003. The early model was limited so upgrades were made and the dramatic entertainment model was released in 2006. Actroids are covered with a silicone skin and have built-in sensors making them (2)................ of reacting  to  humans,  and  they  can  also  mimic  many  human behaviors. (3)................... , they can be programmed to speak in any language. The Korean android, EveR-2, released in 2006, was designed by a team from Kitech. They claim that she is more life-like than Actroids, and she can mimic emtions. She can also speak and move her lips to match  her (4)..................... . Future models are expected to have higher mobility and even be proficient in dancing. Research teams have also created male androids. One in particular is the Germinoid HI-I.
Regardless of the competition, it’s clear that this technology will one day present us (5)..................the dilemma of determining human from machine.

(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 :
Books are normally thought of in terms of the pages that are looked at. They are simple, two-dimensional objects that we read. There are words on the page and occasionally (1)_________ that help us see more clearly what the words are being used to describe. They are sources of knowledge, but more often than not they aren’t considered very special. Some books take it another steps further, though, and their pages jump (2)_________ and form three-dimensional objects. These books can make adults smile and cause children to be wide-eyed with (3)__________. Called pop-up books in our times, they have been around longer than most people think they have. Pop-up books were originally called mechanical books, and these paper (4)________ took a lot of work to make. They were not for children at all, although centuries ago there were practically no books made for children. The mechanical books helped illustrate (5)__________ things as the phases of the moon or were used to teach complex theories

Rewrite sentences without changing the meaning:
He took a taxi so that he wouldn't be late.

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: 
For hundreds of years, giving flowers have been a social means of communication. In the United States, flowers are often given during rites of passage, for commemorating special occasions or as a heartfelt gift between loved ones and friends. Flower gifting also occurs in most countries around the world. However, the meanings and traditions often vary. While students traditionally gave their favorite teacher an apple in past years, in China, teachers are given flowers. Peonies are by far the flower most often given in China. They are also quite popularly used for weddings. Strangely, potted plants are not considered a pleasant gift among Asian cultures. The people believe that like a plant confined by a pot, the gift symbolizes a binding or restriction. In Russia, in lieu of giving birthday presents, the guest of honor receives a single flower or an unwrapped bouquet. Floral arrangements or baskets are not given. Russians celebrate a holiday known as Woman's Day. Traditional gifts include red roses, hyacinths or tulips. When there is a funeral or other occasion where someone wishes to express sympathy, carnations, lilies or roses are given in circular configurations, which signify the transition of birth, life and death to rebirth. In this instance, the color of choice is commonly yellow. For joyous occasions, arrangements and bouquets generally contain an odd number of flowers. In the times of ancient Rome, brides carried flowers to scare away evil spirits and encourage fertility. The Dutch believed that flowers were food for the soul. When invited to someone's home in Great Britain, it is tradition to bring a gift of flowers. All types are acceptable except white lilies, which are usually seen at funerals. Unlike the United States, red roses are a symbol of love. Flowers are generally gifted in odd numbered increments regardless of the occasion. However, the British also have superstitions regarding the number 13, so the number is avoided.

Which of the following is the type of flower that you should not bring to someone's home in Great Britain?

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:
The mineral particles found in soil range in size from microscopic clay particles to large boulders. The most abundant particles - sand, silt, and clay - are the focus of examination in studies of soil texture. Texture is the term used to describe the line composite sizes of particles in a soil sample, typically several representative handfuls. To measure soil texture, the sand, silt, and clay particles are sorted out by size and weight. The weights of each size are then expressed as a percentage of the sample weight.
In the field, soil texture can be estimated by extracting a handful of sod and squeezing the damp soil into three basic shapes; cast, a lump formed by squeezing a sample in a clenched fist; thread, a pencil shape formed by rolling soil between the palms; and ribbon, a flatfish shape formed by squeezing a small sample between the thumb and index finger. The behavioral characteristics of the soil when molded into each of these shapes, if they can be formed at all, provides the basis for a general textural classification. The behavior of the soil in the hand test is determined by the amount of clay in the sample. Clay particles are highly cohesive, and when dampened, behave as a plastic. Therefore the higher the clay content in a sample, the more refined and durable the shapes into which it can be molded.
Another method of determining soil texture involves the use of devices called sediment sieves, screens built with a specified mesh size. When the soil is filtered through a group of sieves, each with a different mesh size, the particles become grouped in corresponding size categories. Each category can be weighed to make a textural determination. Although sieves work well for silt, sand, and larger particles, they are not appropriate for clay particles. Clay is far too small to sieve accurately; therefore, in soils with a high proportion of clay, the fine particles are measured on the basis of their settling velocity when suspended in water. Since clays settle so slowly, they
are easily segregated from sand and silt. The water can be drawn off and evaporated, leaving a residue of clay, which can be weighed.

It can be inferred from the passage that a soil sample with little or no clay in it     .

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It's only 36 centimeters tall, but to fans throughout the world, it represents the highest achievement in football. Every four years, teams from all over the globe compete to take home the FIFA World Cup Trophy, yet nobody ever does. Do you know why? Nobody ever takes it home because the 18-carat gold trophy is kept under lock and key by FIFA (Federation Internationale de Football Association). The champions of each World Cup tournament receive only a replica. This is to protect the valuable prize from thieves, who have stolen the World Cup trophy twice in its 75-year history. The little trophy has certainly had a troubled existence. The original trophy was made by a French sculptor, Abel LaFleur, and was called the "Jules Rimet Cup," in honor of the founder of the World Cup tournament. Sometime during the first three World Cup events (1930, '34 and '38), the name changed to simply the "World Cup." Then during World War II, not much was seen or heard of the trophy. It was being kept hidden in a shoe box under the bed of Dr. Ottorino Barassi, the Italian vice-president of FIFA, to prevent it from falling into the hands of the Nazi army. Although the trophy made it safely through the war, it didn't fare so well during the turbulent 1960s. In 1966, the Cup was stolen during a public showing of the trophy prior to the World Cup tournament in England. Luckily, it was found a short time later none the worse for wear in a trash container, by a little dog named Pickles. Four years later, Brazil earned permanent possession of the original trophy by winning its third World Cup title. Unfortunately, the trophy was stolen a second time, in 1983, and was never recovered. The Brazilian Football Association had to have a duplicate trophy made. After the first trophy became the possession of Brazil's football association, a new World Cup Trophy for FIFA was designed by an Italian artist, Silvio Gazazniga, in 1974. This trophy cannot be won outright, but remains in the possession of FIFA, and rest assured they are keeping a close eye on it. Today, World Cup winners are awarded a replica of the trophy that is gold-plated, rather than solid gold like the real one. Gazazniga's World Cup trophy weighs almost five kilograms. Its base contains two layers of a semi-precious stone called malachite, and has room for 17 small plaques bearing the names of the winning teams -enough space to honor all the World Cup champions up to the year 2038. After that, a new trophy will have to be made.
3. The first trophy was named the "Jules Rimet Cup" because Rimet.....

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The ...... friendly products are designed not to harm the natural environment.

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Rain pounded down on the roof. I was trying to read but the sound was too loud. I couldn’t help myself from being a little grumpy. I wanted to be outside playing, but the rain was keeping me inside. My mom had gone to the grocery store, and my dad was spending Saturday at the office. I had planned to spend the day hiking, but Mother Nature decided that today was the perfect day for rain. It meant that I would have to entertain myself. I spent most of the morning playing with my stuffed animals and reading. I was sitting next to the window staring out when I got a strange idea: why not just go outside anyway? I put on my boots and a big raincoat and stepped out into the wet world. It was raining hard but it wasn’t cold. All I could hear were raindrops and the wind. I decided to go on my hike anyway. My feet didn’t make any sound on the wet ground and the forest seemed different. I went to my favourite place and sat down. In the summer, my best friend Ellen and I would come here and sit for hours. It was our special place. All of a sudden, I thought I heard someone shouting my name. I turned and saw Ellen walking up behind me. “Oh my Gosh! It’s really you, Martha!” she said. “I can’t believe that you are out here right now. I thought I would be the only person crazy enough to go for a walk in the rain.” I was very happy to have some company. We decided that hiking in the rain was just as fun as hiking in the sunshine. We planned on hiking in the rain again.
3. What was keeping Martha inside?

Read the passage below carefully, and then choose the best answer:
In 1971, Sue Coppard worked as a secretary in London. While she enjoyed city life, Sue also missed the countryside where she spent most of her time as a child. So she offered to help out on a farm, or more specifically, an organic farming programme organized by a nearby college. She got a few people to volunteer as well, and they spent the weekend doing “housework,” which involved clearing bushes and cleaning drains. Afterwards, the farm managers said they could come back anytime to help out. Sue put a small ad in a magazine, offering people the chance to volunteer at the organic farm. The volunteer programme grew quickly, and soon other organic farmers joined in, asking for people to help out. With so many people and farms involved, someone needed to organize the different groups. A few of the original volunteers started WWOOF (World Wide Opportunities on Organic Farms) to help volunteers and farmers find one another. Today, at least 50 different countries have WWOOF organizations, and many other countries have individual farms that participate in the movement. While WWOOF is still a weekend activity for some, it now welcomes travellers and people who visit to live and work on farms for longer periods of time. WWOOF volunteers can stay on a farm for weeks or even months at a time in exchange for hands-on farming and gardening experience. The work can be exhausting, but volunteers think it’s worth it. By working on farms, the volunteers interact with farmers and develop a love for the outdoors and organic farming. Many travellers now use WWOOFing as a way to visit new countries and experience new cultures. As travellers will discover, every WWOOF opportunity is a bit different. In Serbia, you can find Misa and Olja, a couple whose farm is known for its hard cheeses and for its bread made from homegrown grains. Finca Amiruca, a farm in Ecuador, teaches volunteers how to grow peanuts, plantains, and yucca. When volunteering in Japan, you may get to learn about growing rice. WWOOF is only one of the many unique volunteer opportunities available. Volunteering is something that anyone can do, and a wide variety of organizations accept or even welcome volunteers. So the next time you get the itch to be active on the weekend or on vacation, why not look for a good cause to spend your energy on?
7. What is special about the farm in Serbia?

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I called the dentist ___________ an appointment to meet him this weekend.

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Only if you get the theater early ______ a chance to get a ticket for tonight's performance.

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Yesterday, I _____ to the restaurant with a client.

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 :
If you are like most students, you probably started this new academic year with a resolution to study harder. Now, science can you help you keep your resolution. Recent discoveries in brain research (1) _______ to better ways to learn. How does the brain (2) _______ new information? Think of the last time someone told you their phone number. Could you remember that number five minutes later? Probably not! That’s because it was in your short-term memory. Our memory actually has three components. Sensory memory takes (3) _______  information from our five senses and is stored for just a few seconds while our brain processes it. Short-term memory works like a “holding area” for new information – that’s where you keep the phone number while you dial it. but if you can put the phone number into long-term memory, you’ll remember that same phone number next week. This part of your memory  (4) _______ everything from irregular verbs to the names of all your cousins. When you study, you transfer new information into long-term memory. Every time we learn something new, the structure of the brain actually changes as we build new connections to information that we (5) _______ know. When there are more connections to the new information, it’s easier to find it again​

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I/ have never/ be/ more beautiful/ a waterfall/ before.

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Harvard University, today recognized as part of the top echelon of the world's universities, came from very inauspicious and humble beginning. This oldest of American universities was founded in 1636, just sixteen years after the Pilgrims landed at Plymouth. Included in the Puritan emigrants to the Massachusetts colony during this period were more than 100 graduates of England's prestigious Oxford and Cambridge universities, and these universities graduates in the New Word were determined that their sons would have the same educational opportunities that they themselves had had. Because of this support in the colony for an institution of higher learning, the General Court of Massachusetts appropriated 400 pounds for a college in October of 1636 and early the following year decided on a parcel of land for the school; this land was in an area called Newetowne, which was later renamed Cambridge after its English cousin and is the site of the present-day university. When a young minister named John Harvard, who came from the neighboring town of Charlestown, died from tuberculosis in 1638, he willed half of his estate of 1,700 pounds to the fledgling college. In spite of the fact that only half of the bequest was actually paid, the General Court named the college after the minister in appreciation for what he had done. The amount of the bequest may not have been large, particularly by today's standard, but it was more than the General Court had found it necessary to appropriate in order to open the college. Henry Dunster was appointed the first president of Harvard in 1640, and it should be noted that in addition to serving as president, he was also the entire faculty, with an entering freshmen class of four students. Although the staff did expand somewhat, for the first century of its existence the entire teaching staff consisted of the president and three or four tutors.
2. The passage indicates that Harvard is .

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Organisms play ________ important role in keeping the nature balanced.

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It was ....... day of the year.

William Sydney Porter (1862-1910), who wrote under the pseudonym of O. Henry, was born in North Carolina. His only formal education was to attend his Aunt Lina’s school until the age of fifteen, where he developed his lifelong love of books. By 1881 he was a licensed pharmacist. However, within a year, on the recommendation of a medical colleague of his Father’s, Porter moved to La Salle County in Texas for two years herding sheep. During this time, Webster’s Unabridged Dictionary was his constant companion, and Porter gained a knowledge of ranch life that he later incorporated into many of his short stories. He then moved to Austin for three years, and during this time the first recorded use of his pseudonym appeared, allegedly derived from his habit of calling “Oh, Henry” to a family cat. In 1887, Porter married Athol Estes. He worked as a draftsman, then as a bank teller for the First National Bank.

   In 1894 Porter founded his own humor weekly, the “Rolling Stone”, a venture that failed within a year, and later wrote a column for the Houston Daily Post. In the meantime, the First National Bank was examined, and the subsequent indictment of 1886 stated that Porter had embezzled funds. Porter then fled to New Orleans, and later to Honduras, leaving his wife and child in Austin. He returned in 1897 because of his wife’s continued ill-health, however she died six months later. Then, in 1898 Porter was found guilty and sentenced to five years imprisonment in Ohio. At the age of thirty five, he entered prison as a defeated man; he had lost his job, his home, his wife, and finally his freedom. He emerged from prison three years later, reborn as O. Henry, the pseudonym he now used to hide his true identity. He wrote at least twelve stories in jail, and after re-gaining his freedom, went to New York City, where he published more than 300 stories and gained fame as America’s favorite short Story writer. Porter married again in 1907, but after months of poor health, he died in New York City at the age of forty-eight in 1910. O. Henry’s stories have been translated all over the world.

(88)________