QUESTION: Fix punctuation: On the 13th September began the Islamic fasting month of Ramadan in which all Muslims fasted from sunrise until sunset
ANS: On the 13th September began the Islamic fasting month of Ramadan, in which all Muslims fasted from sunrise until sunset.

QUESTION: Fix punctuation: Potassium is one of the salts that together with sodium is lost via the stools
ANS: Potassium is one of the salts that together with sodium is lost via the stools.

QUESTION: Fix punctuation: Please note that payment must be from the original card and the cardholder must be present at checkin
ANS: Please note that payment must be from the original card, and the cardholder must be present at check-in.

QUESTION: Fix punctuation: It is recommended that you eat plenty of fruit and vegetables and high protein foods such as fish and chicken
ANS:
It is recommended that you eat plenty of fruit and vegetables and high protein foods such as fish and chicken.