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.

What does this passage mainly discuss?

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
Get More with Klein!
Klein Mobile gives you (1)-------! Customers can choose that perfect plan from the wide variety that we offer. Basic calling plans allow customers to choose between unlimited minutes or 200, 400, or 650 minutes per month. These plans include text message service but not Internet service. Premier calling plans, (2)-------, allow customers to use their phones to access e-mail, social networking sites, and more. Though premier plans cost slightly more, they provide enhanced (3) ------- features

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The musical club “Heartstrings” is definitely for the students who ________ .

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Only a small percentage of information on the (1) _______ is restricted to subscribers or other authorized users. The majority of Web pages are available to (2) _______ who can access a computer that connects to the Internet. The Web has become a (3) _______ for many companies selling products or services, (4)_________ a forum for people to exchange opinions and information. Museums, libraries, government agencies, and schools post information on the Web to make it (5) _______ to others.

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Space Tourism
If you are like most people, you probably dream of spending your next vacation sightseeing or relaxing in a tropical spot. But pretty soon, you may have the option of blasting into space and exploring the universe. It appears that space tourism may start to experience a boom that is sure to be out of this world. Since ancient times, humans have surely dreamed about visiting space. However, it was just a fantasy until 1961, when Soviet cosmonaut Yuri Gagarin became the first person to fly into space. Yet in the years following, only a few highly-trained Soviet and American astronauts managed to leave the Earth’s atmosphere. In the mid-1980s, the US began to relax some of its restrictions. In 1986, an engineer named Charles Walker became the first non-government employee to fly into space. A year later, an American teacher named Christa McAuliffe was chosen to be the first teacher in space. Unfortunately, the Space Shuttle she was on, The Challenger, crashed during takeoff, killing everyone on board. Space tourism got an unexpected boost from the collapse of the Soviet Union. With Russia’s space programme in dire need of money, it became open to offers for space tourism. In 1990, a Japanese reporter was allowed to fly with a Russian crew into space, but the trip would cost his employer $28 million. In the late 1990s, a private company, MirCorp, started organizing trips to space for wealthy individuals. Now, many other companies are trying to do the same. Still, most people who want to become space tourists face a major barrier: the price. Early space tourists have paid dozens of millions of dollars for a seven-to- ten-day stay outside the Earth. However, there are some indications that the price will come down in the near future. Some corporations are gearing up for this with big plans to make space a more hospitable place. The luxurious hotel chain Hilton has expressed interest in opening a space hotel in the next 15 to 20 years. Meanwhile, some experts believe that flights to and from the moon could become a common occurrence within a few decades. Hopefully someday soon we will all have the chance to get to know our solar system a little bit better.
8. It can be inferred from the passage that _________.

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My mother told me she _______ very tired since she came back from a visit to our grandparents.

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I had never been to Denmark before, so when I set out to catch the ferry in early May, I little suspected that by the end of the trip I’d have made such lasting friendships. Esjberg is a (1) ________ port for a cyclist’s arrival, where tourist information can be obtained and money changed. A cycle track leads (2) ________ town and down to Ribe, where I spent my first night. The only appointment I had to keep was a meeting with a friend who was flying out in June. I wanted to use my time well, so I had planned a route which would include several small islands and various parts of the countryside. In my (3) ________, a person travelling alone sometimes meets with unexpected hospitality, and this trip was no (4) ________. On only my second day, I got into conversation with a cheerful man who turned out to be the local baker. He insisted that I should join his family for lunch, and, while we were eating, he contacted his daughter inOdense. Within minutes, he had (5) ________ for me to visit her and her family. Then I was sent on my way with a fresh loaf of bread to keep me going and the feeling that this would turn out to be a wonderful holiday

 A book may be evaluated by a reader or professional writer to create a book ______.

(383)_______

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The Internet: Changing Everything
Let’s do a little experiment: Take five minutes, and find some information about Angola. How did you get your information? How much information were you able to get? Chances are, you probably just went online and typed the word “Angola”. You were probably able to find out all sorts of things. This experiment shows us how useful the Internet is. Over the last 20 years, the Internet has changed the way that we live, work, and study. The biggest change has been the way that we access information. Twenty years ago, you would have needed an encyclopedia to learn about Angola. If you had wanted information, you would have had to get out of your chair, open your encyclopedia, and look up the word “Angola”. Today all you need is about five seconds and you’ll have the exact same information. This technology makes work a lot faster and more efficient. It has also made information storage a lot easier and neater. Twenty years ago, offices had papers and files all over the place. If you wanted to find a file, you had to open a desk drawer and find the right piece of paper. Today, many of us keep our files in cloud storage. Cloud storage is a technology that lets people store files on the Internet. All you have to do is to sign into the site, and you can find all of your files in seconds. Another big change is communication. These days more and more people are working from home. People have “home offices”. They just do their work at their house and e-mail it to their company. It makes life a lot easier. Some people don’t like these changes. They say that life is too convenient these days, and it is making people lazy. However, most people think that even if this technology makes us a little easier, it still has more benefits than disadvantages. In the end, it doesn’t matter what we think. The Internet has changed all of our lives forever.
1. If you use cloud storage, where are your files?

 Read the following passage and choose the correct answer to each of the questions.

"Who talks more - men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has the studied the communication style of men and women, says that this is a stereotype. According to Tannen, women are more verbal - talk more - in private situations, where they use conversation as the “glue’ to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these difference even in children. Little girls often play with one ‘best friend’ and their play includes a lot of conversation. Little boys often play games in groups, their play usually involves more doing than talking. In school, girls are often better at verbal skills, while boys are often better at mathematics. A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children aged 3-6 and their parents. They found evidence that parents talk very differently to their sons than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters, they use more descriptive language and more details. There is also far more talk about emotions, especially with daughters than with sons."

3: Which of the following phrases best explains the meaning of the word “verbal”?

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Would you mind ___________ in the front of the Taxi, Mark?

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LOWELL (March 3) – Just one year after opening, Viggo's Sweet Shop on Park Street has become the place to go for residents wishing to satisfy their sugary cravings. Says owner Viggo Magnusson, "Returning customers bring friends and relatives with them, so the shop is always ---1---." Mr. Magnusson credits the success of his business to the recipes he inherited from his grandmother about a decade ago. ---2---. But the popularity of the pastry shop ---3--- Mr. Magnusson with an unanticipated problem: lack of store space. So when the shoe store next door went out of business recently, he purchased the property to allow for the ---4--- of his shop. Renovations will start in April.

Chọn câu đồng nghĩa:
My mother is very busy at work . However, she takes good care of her children.

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 :
Fossil fuels are used to generate the majority of the world’s energy, and they come in different forms. For example, coal may be burned in a power (1)_________ to generate electricity, but gasoline is burned in a car’s engine to make it run. Neither of these two sources is considered green energy because they produce a lot of pollution when they are burned. In addition, they come from a source that is inevitably going to (2)__________. Green energy can be defined as any energy source that is to some degree non­polluting. When it is called (3)__________, this means that a person can replace the same amount of energy that was consumed by that person (4)__________ that person’s lifetime. Since it took millions and millions of years to create the fossil fuels that we now burn, we know that they cannot be replaced by us. Wind power and solar power, (5)__________ harnessed properly, are two excellent sources of green energy. Once the necessary parts such as wind turbines to generate wind power and solar panels to create solar power have been produced, only the pollution from the production is left.

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We wish _______ to college next year.

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:
Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the
clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water. The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity. Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 per cent of Britain's rainfall, has 30 per cent of its population, and has experienced declining winter rainfall since the 1980s.
In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh water.

Early peoples didn’t need water supply engineering works because     .

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
Today, Canada is made (1) _______ of ten provinces and three northern territories. As a big country, it has many different (2) _______. British Columbia is the westernmost Canadian province and the (3) _______ province on the Pacific Ocean. Mountains (4) _______ most of it. Vancouver, a major port city, is here. The Maritime Provinces lie along the Atlantic (5) _______.

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Among the problems facing the national park's manager, the most serious ones are those of ...... and expansion.

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His teacher regrets _______ him that his application for the job has been turned down.

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The LED Lighting Revolution
If you have picked up any electronics magazines recently, you have probably heard about LEDs; yet chances are, you probably don’t realize why they are so special. The truth is that these tiny light bulbs are helping to improve watches, remote controls, televisions, and a host of other projects. Diodes are components that enable energy to flow in one direction, while simultaneously blocking the current from the opposite direction. This is similar to how a valve works on a faucet. If electronic manufacturers require currents to flow in several directions, then multiple diodes will be included in the circuit design. With LEDs, every time a current passes through them, a light is emitted. LED is short for light-emitting diode. Although they have only recently waves in the past decade or so, early models have been around since 1962. There are several benefits that LEDs offer when compared to incandescent or fluorescent lighting. For starters, they have extremely long-life spans in the range of l00,000 hours even in the toughest conditions. They also require far less energy than power sources, which can save users money over the long run. Since LEDs don’t contain moving parts like other bulbs, they can withstand heavy impacts without getting damaged. Finally, they don’t require any _warm-up time_ so they instantly light up when switched on. The only drawback is that they are still a more expensive to purchase at the moment. LEDs were first used on digital clocks, but they have come a long way since then. They have certainly done a lot to improve TV technology. LED TVs have been a hit because they can be built extremely thin, yet also offer power-saving benefits. LED TVs also provide a wider range of colour, which allows for more lifelike and vivid images. In the future, organic LEDs, or OLEDs, will bring additional benefits for viewers. OLEDs are even more flexible than LEDs, so manufacturers will be able to create bent display screens and lights. Therefore, you will be able to roll up your living room TV set and pack it in your suitcase. In other words, LED and OLED technology will likely be lighting up your life for years to come.
4. The word “_this_” in paragraph 2 refers to ________

MANY KINDS OF MICROBES

There are thousands of different kinds of microbes. Microbes called (1) _______ are the smallest living things. Bacteria live almost everywhere: on land, in water, and even (2) _______ you. Some microscopic life forms are like plants. Tiny diatoms are microbes that live in lakes and the ocean. Diatoms soak up (3) _______ and use its energy to make food, just like plants. Some microscopic life forms are more (4) _______ animals. Protozoa such as the amoeba and paramecium are animal-like microorganisms. An amoeba can move (5) _______ changing the shape of its body. It sticks out a pseudo pod, or false foot. A paramecium is covered with tiny hairs. It waves its hairs rapidly to swim.

(14) ________