question: the fastest and easiest way to open your background file is to double-click it.
Capitalize this past sentence correctly.
A: The fastest and easiest way to open your BACKGROUND file is to double-click it.

question: in the post- apostolic period, and even earlier, the church was characterised by tomb paintings [note 2] and the mysteries.
Capitalize this past sentence correctly.
A: In the post- apostolic period, and even earlier, the Church was characterised by tomb paintings [note 2] and the Mysteries.

question: after 3 .. qf4, black can easily secure a draw after 4. bxf4 kxf4, since both white pawns are lost.
Capitalize this past sentence correctly.
A: After 3 .. Qf4, black can easily secure a draw after 4. Bxf4 Kxf4, since both white pawns are lost.