подобрать предложения из раздела a, корреспондируемые предложениями из разделаb. в пояснениях по каждой паре указать использованное время залог. a. 1. four fifths of our customers are satisfied with our products. 2. the picture was attentively looked at. 3. they've just signed an important contract. 4. 1 was very tired when i arrived home. i'd been working hard all day. 5. we saw an accident while we were waiting for the bus. 6. who does this umbrella belong to? i've no idea. 7. it is very interesting to watch this device in action. 8. he understood the text after he had read it again. 9. mathematics is of great importance for engineers. 10. let them analyse the results of the test. b a. have you ever used this type of machine? b. the newspapers are usually brought in the morning. c. they had been conducting this experiment for two hours before you came. d. it is very difficult for me to work and study at the same time. e. at first i thought i'd done the right thing, but soon i realized that i'd made a serious mistake. f. let me explain the phenomenon in detail. g. the sun is the most important body in the universe for mankind. h. the children at sparta were given a military education. i. are you hungry? do you want something to eat? j.the television was on but nobody was watching it.