QUESTION: Fix punctuation: The substance can be absorbed via inhalation the skin and via gastrointestinal tract
ANS: The substance can be absorbed via inhalation, the skin and via gastro-intestinal tract.

QUESTION: Fix punctuation: The same is true for subtitles and you may combine the two as well if you want
ANS: The same is true for subtitles, and you may combine the two as well if you want.

QUESTION: Fix punctuation: Posted September 4 2009 by TPBC in News
ANS: Posted September 4, 2009 by TPBC in News.

QUESTION: Fix punctuation: India photos of India erotic sculpture Khajuraho Monuments
ANS:
India, photos of India, erotic sculpture - Khajuraho Monuments