Выпишите предложения, содержащие модальные глаголы. переведите их на родной язык. computer capabilities and limitations like all machines, a computer needs to be directed and controlled in order to perform a task successfully. until such time as a program is prepared and stored in the computer's memory, the computer 'knows' absolutely nothing, not even how to accept or reject data. even the most sophisticated computer, no matter how capable it is, must be told what to do. until the capabilities and the limitations of a computer are recognized, its usefulness cannot be thoroughly understood. in the first place, it should be recognized that computers are capable of doing repetitive operations. a computer can perform similar operations thousands of times, without becoming bored, tired, or even careless. secondly, computers can process information at extremely rapid rates. for example, modern computers can solve certain classes of arithmetic problems millions of times faster than a skilled mathematician. speeds for performing decision-making operations are comparable to those for arithmetic operations but input-output operations, however, involve mechanical motion and hence require more time. on a typical computer system, cards are read at an average speed of 1000 cards per minute and as many as 1000 lines can be printed at the same rate. thirdly, computers may be programmed to calculate answers to whatever level of accuracy is specified by the programmer. in spite of newspaper headlines such as 'computer fails', these machines are very accurate and reliable especially when the number of operations they can perform every second is considered. because they are man-made machines, they sometimes malfunction or break down and have to be repaired. however, in most instances when the computer tails, it is due to human error and is not the fault of the computer at all. in the fourth place, general-purpose computers can be programmed to solve various types of problems because of their flexibility. one of the most important reasons why computers are so widely used today is that almost every big problem can be solved by solving a number of little problems - one after another. finally, a computer, unlike a human being, has no intuition. a person may suddenly find the answer to a problem without working out too many of the details, but a computer can only proceed as it has been programmed to.
Have you thought about how much you have in each day there is garbage? Did you know that in Tallinn per capita occurs almost 400 kg of mixed waste per year? Everyone should certainly be reviewed, which he throws in the trash under the sink.
The main part of the contents of the bin, with high probability, accounts for food waste and related packaging. During moving or cleaning become an unpleasant surprise found in a closet not taken out of packaging tools, clothes or other consumer goods, date of purchase which are difficult to remember. Even worse, if it turns out to be the cosmetics that have expired. Waste of money, think of the person first. And the environment?
Here are some tips to reduce the amount of waste arising.
• Go to the store with my bag. This can be plastic bag since last purchase, and even better is a cloth bag or backpack.
• If you constantly forget to take your bag, put in car or bag a spare plastic bag that unplanned trip to the store bag or the bag is already with you.
• Before buying, think you need this thing or you want it only one at a time. Maybe the wiser thing to borrow or buy for a few people, especially for seasonal items (ski, lawn mower, etc.) . Think about all the things that the majority of the time without things stored in the basement.
• Give preference to sold by weight, not packaged product, which is often excessively packaged.
• Buying fruit, you can do one plastic bag, because a single packet can be pasted and a few stickers. Sometimes he does not need, eg. the sticker price can be pasted on a bunch of bananas.
• Sliced product — in recent years the convenience. When cutting food at home you will greatly reduce the waste of packaging. Did you know that the price cut goods in a quarter or half higher?
• Don't buy unnecessary products in large quantities. Consider that in the coming days you are going to cook. So there is less trash you have to throw away later.
• Give preference to goods which are sold and exchangeable fillers.
• As garbage bags use old plastic bags, save on special garbage bags.
• Sort packages and deliver into a container for packaging. So you will help the re-use of packaging and reduce the amount of waste deposited in landfills.
• Give preference to a product with environmental labelling in its production creates less waste.
• In portable electronic devices (flashlight, camera, Sidi player, etc.) instead of disposable batteries use rechargeable batteries — one battery can be recharged up to 1000 times!
• Instead of bottled water for drinking water use filters for the faucet or the filter-jugs.
• Before you throw something, think, can this be repaired, do something else, or to give to someone.
• Do not buy a new mobile phone, TV or other equipment just because the old model went out of fashion.
1. If a burglar breaks into your house, always hand over your valuables.
2. I ran into an old friend at the supermarket yesterday.
3. We ran out of milk, so can you buy some when you're at the supermarket?
4. Hand your car keys over.
5. I saw two policemen running after a robber.
6. Keep your mobile phones swithed off at night.
1. Если в ваш дом вломится грабитель, всегда отдавайте ценные вещи.
2. Вчера в супермаркете я столкнулся со старым другом.
3. У нас кончилось молоко, так что можешь купить его, когда будешь в супермаркете?
4. Отдай свои ключи от машины.
5. Я видел двух полицейских, бегущих за грабителем.
6. Держите свои мобильные телефоны выключенными на ночь.