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1.It was clear that possibility of error (to reduce) if data (to put) correctly info the data processing system. 2. The teacher told us that by the beginning of the 20-th century electromechanical machines (to develop) and (to use) for business data processing. 3. Those early electromechanical processors (to call) unit record ma-chines because each punched card (перфокарта) (to contain) a unit of data. 4. Ones data (to enter) correctly info the computer, human manipulations (to elimi-nate). 5. He explained that a set of instructions and data usually (to insert) through the input equipment to the memory where they (to store). 6. We knew that as soon as information (to enter) info the system properly the human ma-nipulation (to limit). 7. He noted that it (to be) A. Yoffe, the prominent Russian scientist, who (to prove) that semiconductors (can use) for the direct conversion of heat and light into electric power and due to this invention photocells (to de-velop). 8. They said that research work now (to carry out) in that field of science. 9. Father promised that if Nick (to study well) he (to buy) a new computer next month. 10. He said that he not (to know) what the main capabilities of computers (to be).

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