All parents are ________ to at least try to behave in ways that will give their own children an important protection.

(170)_________

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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     .

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The faster we walk,………….. we will get there.

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Prehistoric mammoths have been preserved in the famous tar pits of Rancho La Brea (Brea is the Spanish word for tar) in what is now the heart of Los Angeles, California. These tar pits have been known for centuries and were formerly mine for their natural asphalt, a black or brown petroleum-like substance. Thousands of tons were extracted before 1875, when it was first noticed that the tar contained fossil remains. Major excavations were undertaken that established the significance of this remarkable site. The tar pits were found to contain the remains of scores of species of animals from the last 30,000 years of the Ice Age. Since then, over 100 tons of fossils, 1.5 million from vertebrates, 2.5 million from invertebrates, have been recovered, often in densely concentrated tangled masses. The creatures found range from insects and birds to giant ground sloths, but a total of 17 proboscideans (animals with a proboscis or long nose) - including mastodons and Columbian mammoths - have been recovered, most of them from Pit 9, the deepest bone-bearing deposit, which was excavated in 1914. Most of the fossils date to between 40,000 and 10,000 years ago. The asphalt at La Brea seeps to the surface, especially in the summer, and forms shallow puddles that would often have been concealed by leaves and dust. Unwary animals would become trapped on these thin sheets of liquid asphalt, which are extremely sticky in warm weather. Stuck, the unfortunate beasts would die of exhaustion and hunger or fall prey to predators that often also became stuck. As the animals decayed, more scavengers would be attracted and caught in their turn. Carnivores greatly outnumber herbivores in the collection: for every large herbivore, there is one saber-tooth cat, a coyote, and four wolves. The fact that some bones are heavily weathered shows that some bodies remained above the surface for weeks or months. Bacteria in the asphalt itself would have consumed some of the tissues of other than bones, and the asphalt itself would dissolve what was left, at the same time impregnating and beautifully preserving the saturated bones, rendering them dark brown and shiny.
9. Why does the author mention animals such as coyotes and wolves in paragraph 4?

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions:
There was no alternative for them but to look for a new flat

Choose the letter A, B, C or D to complete the sentences with given words:
In order/ not/ have/ any/ digestive disease, you/ should/ eat/ healthily

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_____ you take a taxi, you'll still miss your train.

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.
Everyone wants to reduce pollution. But the  pollution (1)........... is as complicated as it is serious. It is complicated because much pollution is caused by things that benefit people. (2)............. , exhaust from automobiles causes a large percentage of air pollution. But the automobile provides transportation for millions of people. Factories discharge much of the material that pollutes the air and water but factories give (3).......... to a large number of people.
Thus, to end or greatly reduce pollution immediately, people would have to (4)............. using many things that benefit them. Most of the people do not want to do that, of course. But pollution can be gradually reduced in several ways. Scientists and engineers can work to find ways to lessen the amount of pollution that such things as automobiles and factories cause. Governments can pass and enforce laws (5).............require businesses and traffic to stop, or to cut down on certain polluting activities.

(3)..............................

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She specializes in _______ novels set in eighteenth-century England.

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What is a washing machine used _________?

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If it ______ more humid in the desert of the Southwest, the hot temperature would be unbearable.

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If you’ve got a headache, why don’t you try _______an aspirin?

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The Greatest Light Show on the Earth
If you are a fan of amazing visual displays, planetariums around the world offer some entertaining laser-light shows that are often accompanied by popular music. Yet if you want to see the world’s greatest light show, you won’t be able to catch it indoors. Instead, you will have to head to one of the Poles. In certain spots, you will be treated to colourful streaks of light dancing across the sky. This incredible display is the aurora borealis, and every year people from all corners of the globe flock to witness its wonders firsthand. The Aurora Borealis, or Northern Lights, got its official name in 1621. The name combines the name of the Roman goddess of the dawn, Aurora, and the Roman god of the north wind, Boreas. In ancient times, the aurora completely baffled people’s minds, as science was far more primitive than it is today. Nevertheless, they created many myths to explain them. The Vikings believed the lights were the reflection of dead maidens. The Scots thought they were supernatural beings battling in heaven. Meanwhile, Eskimos thought that the lights were dead souls, and when the colours changed, it was their attempt to contact living friends and relatives. It was not until 2008 that a team of scientists from ULCA finally concluded with certainty what the true cause of these dancing light is. The process begins when solar winds carry charged particles from the Sun through space and into the Earth’s atmosphere. When these charged particles enter the Earth’s atmosphere, they are magnetically attracted to the Earth’s poles. During their journey to these points, they come in contact with nitrogen and oxygen atoms in the sky. These collisions are what cause the aurora. The heights at which the collisions occur determine the colours of the individual lights. For example, when the solar winds collide with nitrogen at least than 96 kilometres above the Earth’s surface, the lights will be blue. If the same collision occurs above 96 kilometres, however, the light will be purple. Or, if the solar wind particles collide with oxygen, the colours produced will be either red or green. However, merely understanding how the aurora works does not do this phenomena justice. To truly appreciate the full splendor of the aurora, you will have to see this Natural Wonder of the World in person.
1. Which of the following statements about the Aurora Borealis is true?

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 beautiful white bears found in the Arctic are in grave danger, and human beings are very (1) _______ the cause of this danger. As we bum fossil fuels to generate electricity or get us around town in our cars and trucks. We create a massive amount of carbon dioxide. This gas has increased in (2) _______. so much over the past few centuries that it is causing global warming. Polar bears need sea ice in order to live because this ice is their hunting (3) _______, The bears’ main source of food is the meat and blubber of seals. These animals come to the surface holes in the ice to breathe. It is there that the polar bears have (4) _______to ambush the seals. Without any ice, there is nowhere for the bears to stalk their prey. The seals rarely venture onto land and spend their time out on the sea ice. In recent years, the sea ice has disappeared in the Arctic during the late summer. This is dangerous for the polar bears, as they rely almost exclusively on seals for food. (5) _______ brown and black bears, polar bears do not hibernate during the winter.

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.
Drone racing is an exciting new sport, that has become popular faster than (1).......... other sport before it. Pilots steer small and lightweight, but high-powered drones along courses with obstacles. They fly through gates and around flags at speeds of over a hundred miles an hour.
 They control the drones using VR-like headgear. Every drone has a camera (2)...........to it so that spectators can also view flights either on a big screen or with special headgear.
The races take place either outdoors - in big stadiums, or indoors in old warehouses and sports arenas. (3)................ are short because the battery time of drones is limited.
(4)..............drone racing started only a few years ago there are already international competitions that take place all over the world. In professional leagues, drone pilots compete for thousands of dollars. In March, the World Drone Prix was staged in Dubai. A 16-year old British teenager not only one the race but also received a prize money of 250 000 dollars.
Television and other media have become aware of drone racing. ESPN, an Amercian sports channel, will be broadcasting international drone races starting this August. Races are also recorded and uploaded to YouTube and other video platforms (5)............. they can be viewed over and over again.
(3).................

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What Is Heritage Protection?
Heritage is traditional beliefs, customs, and culture. We use the word “heritage” in many different ways. People talk about their family’s heritage, their city’s heritage, and their country’s heritage. Here are some examples of heritage. During Chinese New Year, people in China give red envelopes. That is part of Chinese heritage. Every year in the American city New Orleans, there is a huge party called Mardi Gras. That is a part of New Orleans’ heritage. Heritage can also be more private and personal. If your family has a big dinner every Sunday night, that’s part of your family’s heritage. Today, heritage is changing. The Internet connects people around the world. In many ways, this is a good thing, because we can learn about the heritage of other countries, and we can show our own heritage to the world. However, some people worry that traditional heritage is disappearing. Think about it. In many ways, countries are becoming more and more alike. In just about every country around the world, you can find McDonald’s, Nike shoes, Starbucks coffee, and American films. Some people think this is a good change, but others don’t like it. You can decide whether or not you think it is a good thing. However, almost everyone wants to protect their traditional heritage, and sometimes this is hard. For example, when a new McDonald’s opens in your town, a traditional restaurant might have to close. This is why heritage protection is so important. Heritage protection is a simple idea. It means keeping your country’s or your city’s heritage alive. People do this in many ways. The biggest part of heritage protection is probably preserving old buildings. A few other examples of heritage protection are making sure your children speak your traditional language, and teaching your heritage to children. The world is changing very fast. This change brings a lot of good things. But as the world is changing, it is important to remember the heritage of our parents and our grandparents.
6. The word “_beliefs_” in paragraph 1 is closest in meaning to _________

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London/ city/ the/ historic/ is/ of/ buildings.

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Not everybody recognizes the benefits of new developments in communications technology. Indeed, some people fear that text messaging may actually be having a negative (1)_____ on young people's communication and language skills, especially when we hear that primary school children may be at (2)______ of becoming addicted to the habit. So widespread has texting become, however, that even pigeons have started doing it. What’s more, in this case, it's difficult to view the results as anything but positive.
Twenty of the birds are about to (3) ______ to the skies with the task of measuring air pollution, each (4) _____ with sensor equipment and a mobile phone. The (5) _____ made by the sensors will be automatically (6) _____ into text messages and beamed to the Internet - where they will appear on a dedicated 'pigeon blog'

 Rice is the ______ exported product of Vietnam.

(506)_____

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A Microchip in Your Body
In 1998, a British scientist named Kevin Warwick did an experiment. He inserted a small microchip into his left arm. He used the microchip to turn on lights, work with his computer, and even start the water for his hath. After only nine days, Warwick removed the microchip from his arm. Nine days is not a long time, but it was enough to give the world a very important message. It is possible to have a microchip in your body. Many people think that someday, we all will have microchips. There are all kinds of things that a microchip could do. It could be useful for simple, everyday things. You might not have to carry keys, because you could use your microchip to open the front door of your house. You might not need cash, because you could use your microchip to buy things. A microchip might be able to do more important things. For example, a microchip could contain all of your important health information. If you had an emergency and wert to hospital, doctors could read your microchip and learn all of your health history. Some scientists even believe that someday a microchip could help cure diseases. Many people dislike the idea of a microchip in their body. They have a lot of concerns. Is it safe? Could a microchip make you sick? Besides, would other people be able to read your microchip and steal your personal information? People are especially worried about personal freedom. This is probably the biggest reason why so many people are against these microchips. What if your government could use your microchip to watch you? What if your government could use your microchip to find your location? Do you want the government to have that information about you? Again, for most people the answer is “no". Nobody has microchips in their body yet. We don't know if this will ever happen. If we ever do have microchips, we don't know what they would look like or what they would do. What do you think? Would you like to have a microchip inserted into your body?
1. The word “message” in paragraph 1 is closest in meaning to________

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'If I were you, I would take the job,' said my roommate.