Choose the correct option to complete this passage. The electronic computer is the most significant invention since steam engine. While the industrial revolution (28) ..........changed the nature of manual work, the computer revolution is now changing the work (29) .......... by the brain. Nowadays micro-computers are (30) .......... in hundreds of thousands and are constantly being equipped with more and more ingenious (31) .......... Contrary to popular belief, computers themselves cannot make mistakes. The answer will always be correct if the programmed fed (32) .......... the computer is correct.