First, man came up with a simple _ to make their work easier. 2. So, the complex of _ _ _ _ _ _ _ turned into a _ . 3. In our days they are all around us. 4. They all do what is necessary for a human. 5. Examples of machines . 6. The machines consist of three main parts: , , and they. 7. If one of the parts is missing, the machine will not work . 8. The this is a system whose components are AR . 9. Summing up, _ _ engine This is a device for converting a single view from one movement to another. 10. are devices that perform useful work for man and turn one kind the other way.

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