1. Carrots were bought 2 days ago by her.
2. Central Africa was explored be Livingstone in the 19th century.
3. Texts will be brought tomorrow by me.
4. Our skates haven't been brought back.
5. My work had been finished by 5 o'clock.
6. Some experiments were made by us in this laboratory.
7. The car is being repaired by him right now.
8. Son is sent by his parents to rest in the south every year.
9. Milk is sold in this shop.
10. The homework will be done by them in the evening.
11. The trucks had been loaded by 6 o'clock.
12. This program will be shown on TV.
13. The text has been translated be her.
14. All the trees had been planted by the middle of autumn.
15. Golf was being played by children from 4 till 6.
16. When my father came home, apples had been eaten by me.
17. A new center is being built in our street.
18. This story has been forgotten by my granny.
19. This poem was wrote by him in the 18th century.
20. This play will be staged by actors next month.
The future is a strange thing. Here it is, and here it is already the past. At this point, another time becomes the future. So we constantly catch up with him and discover his secrets.
Ten, twenty, thirty years pass, and you seem to be in the future, but it's hard to see how it comes. Look back ten years ago — then you could not have thought that you could not live without the Internet and a smartphone in your pocket. What awaits us in the next decade? A century? Millennia? The future is such a strange thing that you can try an infinite number of times to guess what will happen in ten years, and in some ways you will be right, but this rightness will be drowned in a crowd of new products that will demolish the past like a crane in an old building.Humanity has long been trying to create a silent plane, but so far it turns out so-so
The first aircraft in the world appeared at the beginning of the XX century and made it possible to travel long distances in a short time. The risk of crashing in an airplane is much less than in a car, that is, it is a very safe means of transportation. But all planes at the moment have one big disadvantage — they make a lot of noise. This is especially difficult for military aircraft, which emit noise at 140 decibels when taking off. Such a loud noise can lead to pain in the ears, because the human hearing can hardly withstand such a load. And, most importantly — because of the noise, combat aircraft can be quickly spotted by enemies. But recently, scientists have found out how to create silent aircraft.
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