IV. Choose the best word to complete the passage below.

Most people think ___(1)___ computers are very modern inventions, products of our new technological age. But actually the idea for a computer had been worked out over 2 centuries ago by a man ___(2)___ Charles Babbage. Babbage was born ___(3)___ 1791 and grew ___(4)___ to be a brilliant mathematician. He ___(5)___ up plans for several calculating machines which he called "engines". But despite the fact that he ___(6)___ building some of these, he never finished any of them.
Over the years, people have argued ___(7)___ his machines would ever work. Recently, however, the Science Museum in London has finished building engine based ___(8)___ of the Babbage's designs. ___(9)___ has taken 6 years to complete and more than 4 thousand parts have been specially made.
Whether it works or not, the machine will ___(10)___ on show at a special exhibition in the Science Museum to remind people of Babbage's work.