Taking a math test can be pretty stressful. Even if you know the material, you can still get the problem wrong. Knowing how to go through your math test and check your work can save you from handing in a test full of mistakes that can be avoided. {#blank#}1{#/blank#}

Write it out

    You can also check a math problem by writing everything out on paper. {#blank#}2{#/blank#} Writing out math problems reduces your chances of missing anything to the lowest possible level, which is a common cause of incorrect answers.

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    Make sure your answers work by doing the opposite procedure of what your problem calls for, including the answer you got the first time around. In other words, you would use the opposite of this addition problem—subtraction (减法)—to determine whether or not your answer is the correct one.

Plugging in

    You may find that a variable isn't good enough or have a problem where you have to solve for a variable (变量). {#blank#}4{#/blank#} This is the only real way to assure yourself that the answer you've found is correct.

Check for a reasonable answer

    {#blank#}5{#/blank#} For example, if you get an answer in the millions and you know it should be in the thousands, you've likely misplaced a point. Go back through the work on your paper to make sure all of your formulas and calculations are correct. If everything looks okay, do the problem again and compare the result of the second try to what you've got on the first try.

    Computer technology is still developing rapidly. The computer of the future will continue to increase in value and performance while decreasing in cost. It will become smaller, but faster and more powerful.

    It is possible to make some guesses about what the future of the computer will look like, based upon the types of technologies that are being developed now. A lot of progress has already been made in some of these new technologies, but some are still in their earliest stages and may not be ready for use for years. Two of the most interesting areas of computing that are currently being developed are quantum computing (量子计算) and nanotechnology (纳米技术).

    Quantum computing is one possibility for the future of the computer that could make computers run far faster than even the quickest computers do today. Quantum computers could be able to do what modern supercomputers are unable to do by using transistors that are able to take on many states at the same time.

    Nanotechnology could also change the face of computing, by creating computers that could be very powerful, though they are tiny in size. These computers could be incorporated (并入) into everyday objects, including electrical appliances (电器), clothes and even the human body. We will be able to use computers in new and unimaginable ways. They will become a part of our lives rather than simply being a box that is used only for specific purposes, such as work.

    Quantum computing and nanotechnology will be able to play new roles, which will make us live greener lives, as well as enjoy better health and happier lives.

    Tom goes everywhere with Catherine Green, a 54-year-old secretary. He moves around her office at work and goes shopping with her. "Most people don't seem to mind Tom," says Catherine, who thinks he is wonderful. "He's my fourth child," she says. She may think of him and treat him that way as her son, buying his food, paying his health bills and his taxes, but in fact Tom is a dog.

    Catherine and Tom live in Sweden, a country where everyone is expected to lead an orderly life according to rules laid down by the government, which also provides a high level of care for its people. This level of care costs money.

    People in Sweden pay taxes on everything, so aren't surprised to find that owning a dog means yet more taxes. Some people are paying as much as 500 Swedish kronor in taxes a year for the right to keep their dog, money that is spent by the government on dog hospitals and sometimes medical treatment for a dog that falls ill. However, most such treatment is expensive, so owners often decide to offer health and even life premium for their dog.

    In Sweden dog owners must pay for any damage their dog does. A Swedish Kennel Club official explains what this means: if your dog runs out on the road and gets hit by a passing car you, as the owner, have to pay for any damage done to the car, even if your dog has been killed in the accident.

    Robots that can chat, find misplaced glasses, draw airplanes and play with your children are attracting thousands of visitors during an expo in Tokyo as Japan adapts to changes in society.

    Robots, such as the sound-sensitive Chapit, answer simple questions and even joke with people to help the solitary fight loneliness and stay alert (机警的) in old age. "Many old people in Japan live alone and have no one to talk to," said Kazuya Kitamura, a representative of the expo organizer. "Communication robots stay together with old people and don't mind listening to the same stories over and over again."

    While Chapit, a relatively simple robot, managed to attract a partner, many researchers, such as Kiyoshi Matsumoto, a professor at the University of Tokyo, struggle to attract sponsors for more expensive projects.

    Matsumoto's "Personal Mobility Robot", equipped with four cameras and a sensor to recognize the user's centre of gravity, is designed to help the elderly move around without pressing buttons as in traditional wheelchairs.

    The robot can also help find misplaced glasses by recognizing them with a sensor. "We have developed a robot that can assist many people, but because of the high cost, we still haven't found a sponsor," said Matsumoto, who added that the cost of the machine, if produced in large quantities, would be comparable to that of a small car. "In the current economic environment there are few companies willing to invest (投资) in such a costly project," he said.

    Other robots, such as the award-winning "DiGRO", can support busy parents who have little time to play with their children. The robot can use the Internet to find a simple image and then draw pictures, looking after children while parents work.

    Japan is one of the world's fastest-aging countries and the government predicts that by 2050 the population of people over 65 will reach 40 percent.

Despite extreme cold, cruel ice and being brushed off as mad, Slovenian Davo kamicar became the first person to ski non-stop down Mount Everest. After a dramatic fall over almost sheer cliffs of snow, stones and ice, 38-year-old Kamicar returned to his base camp after five hours of skiing. "I feel only absolute happiness and absolute tiredness," he said. 

Due to the severe weather conditions, Kamicar flung himself back down the mountain as soon as he reached the top rather than have a rest as planned At one point, he had to speed overstretches of ice that collapsed and broke underneath him and could have sent him falling into the deep crevasses(裂缝) that dot the mountain.

The descent (下落) had been widely regarded as extremely dangerous. The Darwin Awards website, known for documenting foolhardy deaths, urged people to log on to their website and "keep your eyes peeled for a live Darwin Award". However, the only body to make the news was the corpse (尸体)of an unknown mountaineer which Kamicar zipped past as he descended one of an estimated 120 corpses, thought to litter the slopes." This mountain is always full of surprises. Seeing a dead man out there was still a shocking experience," he said. 

Thanks to strategically placed cameras on the mountain and one attached to his safety helmet hundreds of thousands of people witnessed the process online, which was one of the record highs ever of more than 650,000 hits. The website was once jammed as people tried to access the site.

A previous failed attempt had already cost Kamicar two fingers when he got frostbite as a fierce storm hit the peak. Coming from a skiing family and had his first Himalayan skiing expedition in 1989, he has been ever since tireless in raising funds and sponsorship for more expeditions, with Everest as the permanent goal.

The Moon Festival is also known as the Mid-Autumn Festival. It is celebrated on the 15th day of the{#blank#}1{#/blank#}(eight) month of the lunar calendar. It's a day to get together with your relatives, admire the moon, and enjoy mooncakes. Here is one way to enjoy a Chinese Moon Festival—cook for the Moon Festival.

Treat your relatives and friends with mooncakes. No Moon Festival is complete{#blank#}2{#/blank#}mooncakes. You can buy them from a Chinese bakery or make them on your own if you have time. You will send them to relatives and friends as{#blank#}3{#/blank#} (present), so prepare enough mooncakes!

Make mooncake biscuits for a sweet treat. Mooncake biscuits aren't as well-known as mooncakes,{#blank#}4{#/blank#}they can still be a tasty dessert for the Moon Festival. They're cookies made from the same dough (生面团) as you use to form{#blank#}5{#/blank#}outside of the mooncakes. You need to wait for 1-2 days{#blank#}6{#/blank#}you can eat them.

Plan a dinner of tasty and{#blank#}7{#/blank#}(tradition) dishes. A Moon Festival dinner{#blank#}8{#/blank#}(offer) delicious for the whole family to enjoy. Think about how many people you{#blank#}9{#/blank#} (invite) over and start to plan your meal. Many families also choose to eat out for the Moon Festival in order not{#blank#}10{#/blank#}(make) a meal-it's up to you!