William Gilbert (1544–1603) ,____________ ( create) an instrument____________ ( call) a versorium that could detect static electricity.
created /called
Even though humans__________ (survive) without electricity, the chances of them surviving without it is highly unlikely.
have survived
Benjamin Franklin (1706–1790), __________ ( want) to prove that lightning was electricity and that it could travel through metal.
wanted
There is one type of electricity that ___________ ( always be) with us: lightning.
has always been
Long ago, people __________ ( know) lightning ___________( be) powerful but they ___________ (not/understand) where it ___________( come) from or how to use it.
knew /was / didn’t understand / came
Humans ___________ ( know) about electricity since ancient times, but learning how to generate it __________ ( not come) until 1831.
have known / didn’t come
Electricity __________ ( have) a huge cultural impact.
has had
Galvani (1737–1798) __________ (be) partly right when he ______ ( think) that the frog’s muscles contained electricity.
was / thought
About 3 million Americans _________( work) in clean energy at the end of 2020.
worked
