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Fill in the blanks with the verbes BE,HAVE
People ... used calculating devices since ancient times. The first electronic digital computer ... built in 1946. The large room ... filled with the computer. Since then rapid improvement in computer technology ... led to the development of smaller, more powerful, and less еxpensive computers. But computers ... not able to think. A user... to tell the computer in very simple terms exactly what to do with the data it receives. A list of instructions for a computer to follow ... called a program.