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19.INTRODUCE

We cannot imagine our life without antiseptics. This invention __________________ in 1850 by a Hungarian physician.

20.ONE

He was the __________________ prominent doctor to make a strong link between the use of antiseptics and improving survival rates of wounded people.

21.BECOME

His work was taken up by others, such as Joseph Lister, who __________________ a pioneer of antiseptic surgery.

22.BEGIN

It __________________ in 1978 when Don Cameron decided to create an event that would help balloonists from all over the world to get together. It was a great idea.