We still tend _ think chewing gum is a fairly recent invention, even _ there is evidence it was used 5,000 years ago in Finland.
to/though
The Ancient Greeks also chewed gum, as __ the Aztecs in Mexico during the sixteenth century.
did
As far as we know, however, it wasn’t __1869 that chewing gum became popular in its present form, __ New York inventor called Thomas Adams first had the idea of adding flavour to it.
until (till)/when
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