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Most people think of computers as very modem inventions, products of our new technological age. But actually the idea for a computer had been worked out over two centuries ago by a man (1)....... Charles Babbage, Babbage was born in 1791 and grew up to be a brilliant mathematician. He drew up plans for several calculating machines which be called"engines". But despite the fact that he (2)...building some of these, he never finished any of them. Over the years people have argued (3)...his machines would ever work. Recently, however, the Science Museum in London has finished building (4)...engine based on oneof Babbage's designs. ( 5 ) _______ has taken six yeahs to complete and mohe tham four thousand Parts have been Specially ( 6 )______.
Whethrit works or not, the machine will be on show at a Special exhibition in the Science Museum to remind People of Babbage's work.

1.A. written. B.called
C.recognized. D.known
2 A.wanted B.stared
C.made. D.missed
3 A.until. B.whether
C.though. D.why
4 A.that. B the
C some. D. an
5 A.he. B.they
C.one. D.it
6 A.make. B.made
C.makes. D.making