Сэтими текстами как их правильно читать, нужно написать по текст как читать его на 1. we are always told that we should clean our teeth regularly to keep them healthy and to have fresh breath. it is believed that people started using a kind of paste to clean their teeth around 5000 years ago. however, the ingredients of these tooth powders were very different from ours. for example, the people of ancient egypt used salt, mint, dried flowers and pepper to create tooth powder. later, in the 18th century, in some countries in europe, people brushed their teeth with burnt bread. the first toothpaste appeared in 1890, in great britain. at first it was sold in jars. then special tubes were designed to make the toothpaste more comfortable to use. 2. a robot is a machine that does work for people. the word ‘robot’ appeared in the 1920s and it was first used in a science fiction story. in real life, the robot was invented later, in 1954. there are different kinds of robots which are used in different industries. most of them are operated with the help of a computer program. instead of humans, robots do hard and boring work in unpleasant or dangerous environments. they usually work faster and more accurately than people. they never get tired and do not make mistakes. nowadays robots are often used for domestic needs – to clean houses or to look after sick and elderly people. scientists say that soon robots will become a normal part of our life, like mobiles and computers today.

1peter: you (have been telephoning) for ages. have you not nearly (finished)? jack: i (have not got) through yet. i (have been trying) to get our paris office but the line (has been ) engaged all morning. 2 ann (has failed) her driving test three times because she's so bad at reversing. but she (has been practising) reversing for the last week and i think she (has got) a bit better at it. 3 tom: i have often (wondered) why bill left the country so suddenly. peter: actually, i have just (found) out. 4 he (has been playing) the bagpipes since six o'clock this morning. he has only just (stopped). 5 why have you (not brought) me the letters for signature? have you (not typed) them yet? 6 tom (looking up absent-mindedly as mary comes in): have you been (sunbathing)? mary (crossly): don't be ridiculous! it (has been raining) all day! 7 a pair of robins (have been building) a nest in the porch since last week. i (have been watching them from my window since they began. 8 the police (have not found) the murderer yet, but the dead man's brother (has been) in the station all day. the police say that he (has been helping) them with their enquiries. 9 they (have pulled) down most of the houses in this street, but they (have not touched) the old shop at the corner yet. 10 tom is convinced that there is gold in these hills but we (have been searching) for six months and (have not seen) any sign of it. 11 i (have been waiting) for the prices of the houses to come down before buying a house, but i think i (have been waiting) too long and the prices are beginning to go up again. 12 peter (has been) a junior clerk for three years. lately he (has been looking) for a better post but so far he (has not found) anything.

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