Workers aren't allowed to go into a big underground computer center until they step up to a machine that takes a quick picture of the tiny blood vessels (血管) inside their eyes.

    If the machine can't 1 the picture with images in its computer, the worker is stopped by security guards (保安员).

    Each person has his own way of blood vessels in his or her2.And unlike a key, the way can't be3.Old-fashioned keys and locks may soon be things of the past.High-tech security devices (安全装置) are being fixed at military (军事的) bases, computer centers and banks.Companies that 4 the machines say they'll someday be used in people's homes and cars.

    Already, a Japanese company has fixed ways that recognize (识别) people's fingerprints in 360 new homes.The machines open the doors only for the 5of the houses.The new security ways are selling well because thieves and robbers are getting better at breaking into buildings and computers that are 6 by keys and locks.Since nobody can steal or copy a fingerprint, or one's eyes, the new machines are 7.

    Other new machines recognize one's voice.Two American companies use 8 machines to keep an eye on their computers.Inexpensive voice-recognition machines may someday take the place of locks on cars.The doors would open only for the owners.The machines would 9 the owners as little as $270.Although the up-to-date machines are amazing, scientists must still solve a serious problem.How will a boy borrow his dad's car without borrowing his dad's 10?

    As we know, life today has many problems. One of the biggest is 1, such as water pollution, air pollution, 2 pollution and so on. Water pollution makes our rivers and lakes 3. It kills fish and pollutes our drinking water. Air pollution is the most serious kind of pollution. 4 bad for living things in the world. Noise pollution 5 us talk louder and become angry 6.

    The Earth is 7 home and we must save it. We can't 8 rubbish here and there. We should go to work and school 9 bus or with our friends in the same car. Everybody 10 save the Earth.

    We often find that weekends and holidays feel so short while classes and work feel so long. Actually, though, we know that this is not true. But we still wonder where that strange feeling comes from.

    In fact, this is one of the ways that we're tricked by time, according to the website. All that S interesting. The website lists several wrong impressions (印象) we often have about time. Let's have a look.

    First of all, emotions affect (影响) our time-keeping abilities. Negative emotions (消极情绪). especially anxiety and boredom, make time seem longer because they make us concentrate (集中) more on the passage of time. However, when we are enjoying ourselves, we pay more attention to what we are doing and are likely to lose track of (失去对……的意识) time.

    Here is another example. In 2007, a group of scientists carried out a test. In the test, people fell 50 meters into a safety net and were then asked about their experience. Although the experience took shorter than 3 seconds, the people thought it was much longer than it actually was.

    This is because of the way our bodies reply to danger, according to the scientists. Our bodies produce a chemical called adrenaline (肾上腺素) when we are faced with danger. It allows us to concentrate better so that we can stay alive. As a result, we are able to remember far more details (细节) over a short period of time, which makes it seem like time is going more slowly.

    Another situation when we make mistakes about time is when we take afternoon naps (午觉). Have you ever had trouble telling what time it is after a long nap? That's because the best amount of time for a nap is 20 minutes. After 20 minutes, you enter a new stage of sleep called slow-wave sleep. If you wake up mid-way in this stage, it will take a while before you can correctly perceive (感知) time again.

    Yes, time can be mysterious (神秘的) and there is no way to control it. So, perhaps the best thing to do is to make good use of every minute.

Eating out is more popular in Britain today than it has ever been. It is reported that British people spend more eating out than cooking for themselves and eating at home. It seems that many British people are becoming more and more interested in how good their food tastes, and also how healthy it is.

However, eating out can also be expensive, so British people do not eat out every night. When having a date with friends, or having a birthday, many people like to go to a restaurant, and people often also eat in a restaurant before going to the cinema or the theater.

As in all cultures, there are many rules of manners about eating. The knife and fork should be used in the correct way. It is also impolite to speak with your mouth full then you are eating.
    Most British cities have a large collection of food as well as British food, from the very cheap to the very expensive—French, Italian, Indian, Chinese, Thai, Japanese and many, many more.

When people are too tired to cook after work, they often get a "takeaway". This means that they order from a take－out restaurant by telephone, and then go to get it. Many take-out restaurants also send it to your house. All you have to do is to open the door, pay and eat!

    Being street smart is an important skill to have and a good way to take care of yourself.

    Always carry your phone with you, but do not look at 1 while you are walking. Being able to communicate or call for help is important, so keep a list of useful numbers. But put your phone away while you are walking so that you can keep your 2 up and see what's going on around. If you do need to check your phone, 3 and look at it quickly.

    Don't wear earphones 4 you are out. If you have to 5 something when you're out, use only one earphone or play it at a very low volume(音量).

    Travel with 6 or family members when possible and never go anywhere with a stranger. It's 7 to be careful with strangers. Remember not to get into a stranger's car if they call you over.

   8 dark and out-of-the-way places. Do not take short cuts through dark areas, even if it will make your trip much faster. If you have to go to unsafe places, go 9 someone you know or speak to someone over the phone while you are there.

    Run and shout if you feel unsafe. Run away as fast as you can towards a police station, hospital, or nearby business for 10. Shout as loudly as you can to get the attention of people nearby.