_____is known as the Father of COmputer. 

___________ could add, subtract, multiply and divide automatically.

There are historical evidences to prove that Abacus was first used in _________.

In _________ generation, the used of transistors made computers smaller, faster and less expensive.

In third generation computers _________ helps to increase the speed and efficiency of computers.

___________ improved Pascal's machine.

The working principles of today's computers were provided by an English mathematician. 

Which of the following is still useful for adding numbers? 

In _________, John Napier invented a calculating device called Napier's Bones.

__________ was the first calculating device invented around 5000 BC in China.