The ancient Greeks sent messages by using ______., Signal towers with fires, Mobile phones, Two parallel columns of smoke meant ______., The successful return of a war party, The start of a battle, Native Americans used ______ to send messages., Written letters, Smoke from fires, ؟When was the first email sent, ln1999, ln1971, ؟What was the first email message, QWERTYUIOP, HELLO WORLD”.

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