question: i repeat: there has to be a cause for every effect.
Capitalize this past sentence correctly.
A: I repeat: There has to be a CAUSE for every EFFECT.

question: in 1993, 15,139 letters from american jewish children were sent to queen margrethe on the occasion of the 50th anniversary of the rescue of the danish jews (the danish jewish museum).
Capitalize this past sentence correctly.
A: In 1993, 15,139 letters from American Jewish children were sent to Queen Margrethe on the occasion of the 50th anniversary of the rescue of the Danish Jews (The Danish Jewish Museum).

question: transfer from monteriggioni to perugia (peg) airport
Capitalize this past sentence correctly.
A: Transfer from Monteriggioni to Perugia (PEG) airport