Choose the correct alternative to complete the text. Olafur Nielson 1has designed/has been designing musical instruments since he was a child. In fact, in the last ten years he 2has built/has been building more than twenty different drum machines. But his most recent devices aren’t just any kind of musical instrument. Nielson 3has worked/has been working alongside researchers to develop instruments which can be played using thought, instead of hands and feet. Cognitive scientists 4have known/have been knowing for several years that the electric impulses created by thoughts can be used to express simple sounds and communicate ideas, but what Nielson 5has just developed/has just been developed goes beyond that. Using open source technology, Nielson 6has completed/been completing a prototype of a keyboard which can be played when connected to sensors on the musician’s head. According to initial reports, what Nielson 7has done/has been doing should give all would-be musicians total freedom of musical expression. Over the last few months Nielson and his team 8have looked/have been looking for a commercial sponsor to take their device to the market. Since January they’ve 9spoken/been speaking to several leading technology firms who seem to be showing interest. ‘You know, I’ve 10always dreamt/always been dreaming that one day something I built could make a huge difference to people’s lives. Now I think I’ve 11managed it/been managing it.’

Archimedes. Why in the first place was the ancient Greek scientist? First of all, because he is one of the greatest mathematicians of all times, close he came to the calculation of the number of "PI". Today all students and students of the daily study and enjoy the discoveries of the Greek. Also Archimedes was famous for the invention of many useful machines. Among these are the siege guns, and mirrors, поджигающие sails on the Roman ships by focusing sunlight. Archimedes made the first theorist of mechanics. For example, he presented the complete theory of the lever, applying it in practice. Also, scientists have developed a Archimedes screw (screw), with the help of which вычерпывается water and the present day. The primacy of the inventor of merit - all of it was opened more than two thousand years ago, when there were no computers, no technology available today, the inventors. Archimedes, perhaps, he studied in the libraries of Alexandria, but most of his knowledge was acquired independently.

                                                          A Healthy Lifestyle

I consider that man’s health depends on his mode of life. To prevent the diseases it’s necessary to keep some simple regulations: to go in for sports, to eat carefully, to take a rest and to walk frequently in the open air. I’m fifteen years old and the last three years I do my morning exercises. It inspirits and gives strength to me for a whole day. I add dousing with cold water in winter. I think that conditioning to the cold is the main method for preserving my health. My favourite winter sports are cross-country skiing and skating. I prefer to run in the park and play tennis in summer. I go to the swimming pool twice a week the whole year round. Swimming increases the respiratory system. I also try to observe a day regimen. Every day I go to bed and get up at approximately the same time. I give special attention to meals. I don’t eat fatty and high-calorie foods and I don’t drink heavily gas-cut beverages. At my time of life some peers smoke and drink alcohol but I think that it’s dangerous for a human organism and sooner or later it will be injurious to our health. I think that everybody must begin to take care of his health in his youth because it’s easier to take care of our health than to recover it.

                                                              Здоровый образ жизни

Я считаю, что здоровье человека зависит от его образа жизни. Для того чтобы не болеть, нужно соблюдать несколько простых правил: заниматься спортом, правильно питаться, полноценно отдыхать и чаще бывать на свежем воздухе. Мне 15 лет, и из них 3 последних года я делаю по утрам зарядку. Это придаёт мне бодрости и сил на весь день. Зимой я добавляю обливание холодной водой. Считаю закаливание самым главным сохранения здоровья. Мои любимые зимние виды спорта это бег на лыжах и катание на коньках. Летом я предпочитаю бегать в парке и играть в большой теннис. Круглый год я посещаю бассейн два раза в неделю. Плаванье укрепляет дыхательную систему. Также я стараюсь соблюдать режим. Я ложусь и встаю в одно и то же время каждый день. Особое внимание я уделяю питанию. Я не ем жирную и высококалорийную пищу, и не пью сильно газированных напитков. В моём возрасте некоторые сверстники уже курят и употребляют алкогольные напитки, но я считаю, что это разрушительно для организма и если не сейчас, то в будущем обязательно скажется на здоровье. Мне кажется, что каждый человек должен начинать заботиться о своём здоровье в молодости, так как уберечь здоровье проще, чем вернуть его.