question: it seems that all roads lead her to a haunted and abandoned mansion. a terrible tragedy occurred in that place many years ago.
Capitalize this past sentence correctly.
A: It seems that all roads lead her to a haunted and abandoned mansion. A terrible tragedy occurred in that place many years ago.

question: what is the difference between paid members and free members?
Capitalize this past sentence correctly.
A: What is the difference between paid members and free members?

question: the opportunity for different artists to meet each other creating different artistic expressions and do promotion is an important element for the development of art.
Capitalize this past sentence correctly.
A: The opportunity for different artists to meet each other creating different artistic expressions and do promotion is an important element for the development of art.