A.invented
B.discovered
C.found
D.developed
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A.when
B.the moment
C.which
D.that
A.for
B.on
C.to
D.of
A.from
B.with
C.than
D.to
A.from
B.with
C.than
D.to
A.did
B.are doing
C.will do
D.do
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