1. B. Pascal built an adding machine in 1642.
2. The scientists were carrying out an important experiment when the power was suddenly cut off.
3. He said that he had never received the fax from us.
4. Any computer performs four basic arithmetic operations.
5. He is typing the list of new students now.
6. We will place the + sign between these numerals.
7. John was installing the new electronic game on the computer when the boss suddenly came into the office.
8. Software instructs the hardware how to conduct operations and in what order.
9. I have erased some temporary files from the hard disk.
10. The famous Russian scientist M. V. Lomonosov compiled a lot of calculating tables.
11. The participants of the conference were discussing the problems of artificial intelligence during the yesterday's sitting.
12. Wait, please! The program is analyzing the registry now; this might take several minutes.