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?

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Traveling in the Future
These days, if you want to travel from New York to Beijing, the flight takes about 16 hours. You also have to wait at the airport, and sometimes you have to transfer onto a different airplane. If you add all of that extra time, the trip takes at least 20 hours. But in the future, the trip from New York to Beijing might only take two hours. Right now, a private company is developing something called ET3. ET3 stands for “evacuated tube transport technology”. Here is how it works. A tube goes all the way from New York to Beijing. The tube is only a few meters wide. Capsules move through the tube. Six people can sit in one capsule. The capsules use electricity instead of gasoline. For international travel, the capsules can travel at about 6,500 kilometers per hour. That is much faster than airplane – most modern airplanes usually only fly at about 800 kilometers per hour. So how is this possible? How can these capsules travel so fast? The answer is that there is no air inside the tube. When airplanes fly, they have to move through the air. The air slows the airplanes down. Because there is no air in the ET3 tubes, the capsules are able to move at a very high speed. Besides, the capsules are quite light. They only weigh 183 kilograms. There are other advantages to ET3. Because it uses electricity, it is quite clean. In addition, it is much quieter than airplanes and cars. Finally, ET3 tubes and capsules don’t require very much building material. Of course, ET3 doesn’t exist yet. The technology is still being developed. Developers still have to solve a lot of problems. The biggest problem is that right now, ET3 would be far too expensive. In order to make ET3 cheaper, we will need much better technology. It is exciting to think of how ET3 will change travel in the future. Maybe someday, you will be able to have lunch in New York and dinner in Beijing.
4. All of the following are factors that make ET3 travel fast EXCEPT that _________

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Although he created the game of basketball at the YMCA in Springfield, Massachusetts, Dr. James A. Naismith was a Canadian. Working as a physical education instructor at the International YMCA, now Springfield College, Dr. Naismith noticed a lack of interest in exercise among students during the wintertime. The New England winters were fierce, and the students balked at participating in outdoor activities. Naismith determined that a fast-moving game that could be played indoors would fill a void after the baseball and football seasons had ended. First he attempted to adapt outdoor games such as soccer and rugby to indoor play, but he soon found them unsuitable for confined areas. Finally, he determined that he would have to invent a game. In December of 1891, Dr. Naismith hung two old peach baskets as either end of the gymnasium at the school, and, using a soccer ball and nine players on each side, organized the first basketball game. The early rules allowed three points for each basket and made running with the ball a violation. Every time a goal was made, someone had to climb a ladder to retrieve the ball. Nevertheless, the game became popular. In less than a year, basketball was being played in both the United States and Canada. Five years later, a championship tournament was staged in New York City, which was won by the Brooklyn Central YMCA. The teams had already been reduced to seven players, and five became standard in the 1897 season. When basketball was introduced as a demonstration sport in the 1904 Olympic Games in St. Louis, it quickly spread throughout the world. In 1906, a metal hoop was used for the first time to replace the basket, but the name basketball has remained.
7. What does the author mean by the statement in paragraph 5: "When basketball was introduced as a demonstration sport in the 1904 Olympic Games in St. Louis, it quickly spread throughout the world"?

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My family lives near a small school. There are four ................. (1) in it: my parents, sister and me. I am the youngest member. My father is a worker in the factory. He works such as an engineer. He ............... (2) up early in the morning. First he brushes his teeth and ................. (3) his face. Then he has a bread ............... (4) breakfast. His work starts from7.00 a.m to 4.00 pm so He comes ............... (5) home very early. In the evening He stays at home, watches TV and goes to bed at 10.00 pm. And my mother is an English teacher at Hung Ha town. My parents are very young. My sister is a student .................... (6) Minh Khai primary school. She is thirteen years old. She is in her classroom. She is studying Arts subject. She can draw many pictures. They are very beautiful. She likes Arts the most because she wants to be an artist. I am a student too, I like ................... (7) football, go fishing, go camping and go swimming in summer. Last year my family went to Ho Chi Minh city to visit our uncles and aunts. They ..................... (8) many photos with my family. I bought a lot of souvenirs ................. (9) my friends. Now I am in my class I am learning English because tomorrow my school is holding the English language Festival. All the teachers and students are going to .............. (10) beautiful school uniforms. We are going to have a good time

Read the following passage and choose the best answer (A, B, C, D):
Although he created the game of basketball at the YMCA in Springfield, Massachusetts, Dr. James A. Naismith was a Canadian. Working as a physical education instructor at the International YMCA, now Springfield College, Dr. Naismith noticed a lack of interest in exercise among students during the wintertime. The New England winters were fierce, and the students balked at participating in outdoor activities. Naismith determined that a fast-moving game that could be played indoors would fill a void after the baseball and football seasons had ended. First he attempted to adapt outdoor games such as soccer and rugby to indoor play, but he soon found them unsuitable for confined areas. Finally, he determined that he would have to invent a game. In December of 1891, Dr. Naismith hung two old peach baskets as either end of the gymnasium at the school, and, using a soccer ball and nine players on each side, organized the first basketball game. The early rules allowed three points for each basket and made running with the ball a violation. Every time a goal was made, someone had to climb a ladder to retrieve the ball. Nevertheless, the game became popular. In less than a year, basketball was being played in both the United States and Canada. Five years later, a championship tournament was staged in New York City, which was won by the Brooklyn Central YMCA. The teams had already been reduced to seven players, and five became standard in the 1897 season. When basketball was introduced as a demonstration sport in the 1904 Olympic Games in St. Louis, it quickly spread throughout the world. In 1906, a metal hoop was used for the first time to replace the basket, but the name basketball has remained.
6. Where in the passage does the author discuss the first basketball championship tournament?

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When I have free time, I usually ______.

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
These features were discovered and explored (1) _______ in the late 1940s. The Lomonosov Ridge, the major ridge, cuts the Arctic Basin (2) _______ in half, extending as a submarine bridge 1,800 km (1,100 mi) (3) _______ Siberia to the northwestern tip of Greenland. Parallel (4) _______ it are two shorter ridges: the Alpha Ridge on the North American (5) _______, defining the Canada and Makarov basins, (6) _______ the Arctic Mid-Ocean Ridge on the Eurasian side, (7) _______ the Nansen and Amundsen basins. The average (8) _______ of the Arctic Ocean is only 1,300 m (4,300 ft) (9) _______ the vast shallow expanses on the continental shelves. The deepest (10) _______ in the Arctic Ocean is 5,450 m (17,880 ft).

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I don't like that man. There is a sneaky_________ look on his face.

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Which ____________ is the documentary on?

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If the sun hadn't been shining, we _________ gone to the beach yesterday.

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The Chinese eat special ____ for the moon festival. They are sweet and are made with a lot of eggs.

Read the following passage and choose the best answer (A, B, C, D):
Ever since it was first possible to make a real robot, people have been hoping for the invention of a machine that would do all the necessary jobs around the house. If boring and repetitive factory work could be (1) ________ by robots, why not boring and repetitive household chores too? For a long time the only people who really gave the problem their attention were amateur inventors And they came up against a major difficulty. That is, housework is actually very complex It has never been one job it has always been many. A factor robot (2) ________ one task endlessly until it is reprogrammed to do something else. It doesn’t run the whole factory. A housework robot on the other hand, has to do several different (3) ________ of cleaning and carrying jobs and also has to cope (4) ________ all the different shapes and positions of rooms, furniture, ornaments, cats and dogs. (5) ________, there have been some developments recently. Sensors are available to help the robot locate objects and avoid obstacles. We have the technology to produce the hardware. All that is missing the software- the programs that will operate the machine

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
MEMORANDUM
TO : Accounting Staff
FROM : Ananda Jeyraj, Comptroller
RE : Revised deadline for departmental audits
DATE : April 3
Since we are short of two staff members who went on a business trip, I have decided to (1)------- the April 12 deadline for the quarterly audits of all department budgets. Your reports on the financial status of each section of the corporation will be due on  April 28. I cannot prolong the due date any later than this, though. I appreciate (2)------- hard work and will keep it in mind when performance-based salary increases are (3)------- at the end of the year

Rewrite sentences without changing the meaning
 Do you have a food processor at your house?

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When you save energy, you not only save money, you also reduce the demand for ___________ such as coal, oil, and natural gas and that is a great way to play a part in saving the planet.

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Space Debris
Once something is considered rubbish, we want to throw it away and forget about it. Yet if we are not careful about where we store it, our garbage could come back to haunt us. On the Earth, poorly discarded garbage can cause land, water, and air pollution. And now, people are starting to learn that space debris can also cause a host of different problems. Space debris is defined as a collection of objects that orbit the Earth. Space debris can be classified into two categories. One is man-made rubbish, such as old satellites, rockets, and other machinery left in space after past missions. The other is natural objects, such as meteors that are traveling through space. If you think the man-made garbage doesn’t amount to much, guess again. Researchers estimate that there are over 20,000 pieces of large debris floating around in space and approximately 300,000 smaller pieces in orbit as well. Traveling at speeds of up to 17,500 miles per hour, these objects create a great degree of danger for any spaceships when they leave or return to the Earth. We are lucky to some degree that there haven’t been too many accidents caused by space debris as of yet. Still some incidents have occurred. In 1996, a French satellite was damaged after it crashed into debris from an old French rocket. Then in 2009, an old Russian satellite collided with a working US satellite. The end result was an additional 2,000 pieces of space junk that was added to the junk pile. As the current situation can only worsen, it is now up to the international community to cooperate and create a plan to deal with space debris. For starters, several nations have pledged to take more care with the items they discard in space to cut down on future debris. Researchers are working on devising a way to label space junk, so it can be avoided. Others have proposed more creative techniques to recapture the garbage and discard it on the Earth, or destroy it with lasers. The nightmare scenario that everyone fears is if the Kessler Syndrome starts to occur. This is when the density of garbage becomes so high that it sets off a chain reaction of collisions which would raise the probability of accidents even further. Although there is not a long-term solution in place for space debris, nations are starting to understand the seriousness of this problem.
1. Space debris is _________ the Earth.

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Cleaning the World’s Oceans
Imagine taking a romantic walk on the beach with your loved one. As the sun begins to set, you hope to treasure this moment forever. Just then, your bare feet stumble over something and you hear a crack. You have just stepped upon a plastic soda bottle and some junk that the tide has washed ashore. Scenarios like this are happening more frequently due to an access amount of sea rubbish, and the worst of it is found far from land. The increasing accumulation of garbage in oceans is due to a number of factors. Studies suggest that 80 percent of all debris originated on land. The majority of this waste is in the form of plastics. This is particularly troublesome because plastic does not degrade at the same rate that other materials do. Therefore, these articles will remain there for quite some time. Some of the pollution is caused accidentally. For example, about 10,000 product-filled containers are lost at sea every year by freight ships. In other cases, the littering is more deliberate, such as the moment when people toss things into the water from boats or land. One of the most startling discoveries of recent years was an area which is now dubbed the Great Pacific Garbage Patch. It is a large collection of marine debris that collected in the North Pacific Ocean. Although the patch is quite massive, it is undetectable from satellites in space because most of the rubbish is underneath the surface. It was discovered in 1997 by a man who happened to spot it while returning home from a sailing race. The patch formed as a result of rubbish being carried by currents and then getting trapped in the area. Thankfully, the problem of ocean garbage is not being ignored. Organizations like the National Oceanic and Atmospheric Association (NOAA) are taking action. It has funded 76 projects that take an aggressive approach to eliminating sea rubbish. Since 2006, it has removed 3,814 metric tons of marine debris from oceans. Methods of rubbish removal include using machines that skim the surface of ocean waters and remove any drifting materials found. In addition, special traps are set by the mouths of rivers to snatch rubbish before it reaches the sea. If everyone does their part, sea rubbish seems like an issue that can be resolved.
8. What is the tone of the passage?

Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
You will never eat there at the weekend unless you have made a reservation.

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My English teacher _____ Mr Tuan Anh.

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:
There are three valid arguments to support the preservation of endangered species. Aesthetic justification contends that biodiversity contributes to the quality of life because many of the endangered plants and animals are particularly appreciated for their unique physical beauty. The aesthetic role of nature in all its diverse forms is reflected in the art and literature of every culture attaining symbolic status in the spiritual life of many groups. According to the proponents of the aesthetic argument, people need nature in all its diverse and beautiful forms as part of the experience of the world.
Another argument that has been put forward, especially by groups in the medical and pharmacological fields, is that of ecological self-interest. By preserving all species, we retain a balance of nature that is ultimately beneficial to humankind. Recent research on global ecosystems has been cited as evidence that every species contributes important or even essential functions that may be necessary to the survival of our own species. Some advocates of the ecological argument contend that important chemical compounds derived from rare plants may contain the key to a cure for one of the diseases currently threatening human beings. If we do not protect other species, then they cannot protect us.
Apart from human advantage in both the aesthetic and ecological arguments, the proponents of a moral justification contend that all species have the right to exist, a viewpoint stated in the United Nations World Charter for Nature, created in 1982. Furthermore, if humankind views itself as the stewards of all the creatures on Earth, then it is incumbent upon human beings to protect them, and to ensure the continued existence of all species. Moral justification has been extended by a movement called “deep ecology,” the members of which rank the biosphere higher than people because the continuation of life depends on this larger perspective. To carry their argument to its logical conclusion, all choices must be made for the biosphere, not for people.

The author mentioned all of the following as justifications for the protection of endangered species EXCEPT     .

Chọn câu đồng nghĩa:
"Let's go out for a walk now," he suggested.