question: this poster from france dates back to around 1900 and is still used in retro campaigns today.
Capitalize this past sentence correctly.
A: This poster from France dates back to around 1900 and is still used in retro campaigns today.

question: qe: electrical panel lock type with st. steel screw and washer.
Capitalize this past sentence correctly.
A: QE: electrical panel lock type with st. steel screw and washer.

question: this is not merely a coincidence.
Capitalize this past sentence correctly.
A: This is not merely a coincidence.