1 - Replace the letter with the appropriate tense of the verbs in parentheses to complete the sentences about the history of the radio.
James Clerk Maxwell A (not/create) the first radio.
He B (develop) the first radio-wave mathematical formula.
In 1888, Heinrich Hertz C (test) Maxwell’s assumption.
The radio D (be) a subdivision of telecommunication.
“When E Oliver Lodge F (name) the coherer?” “In 1894.”
In 1888, Temistocle Calzecchi-Onesti G (demonstrate) that a tube with iron filings
conducted an electrical current.
Radio communication H (involve) the transmission of electromagnetic waves.
Before the 19th century, many scientists I (try) to invent something like the radio.
Marconi J (notice) that electromagnetic waves K (travel) between
two points separated by an obstacle.