What do u mean? all of the words are bold....
The gerunds are Skiing, sailing, and swimming
A

is used to show a large pause or interruption in thought within a sentence.
A comma does not make sense because all a comma does is separate elements in a sentence; a colon separates thoughts and/or enumerations.
Thus, dash was the only reasonable answer.
You're welcome.
I can’t for only 5 points it’s a lot of work for that much Na man sorry but like it’s to much tho but soon I wil
" Just as the image of the leper, cut off from all contact" . This is a Metaphor. A example of sin. The leper was isolated from everyone around him.