QUESTION: Fix punctuation: The fastest and easiest way to open your BAD file is to doubleclick it
ANS: The fastest and easiest way to open your BAD file is to double-click it.

QUESTION: Fix punctuation: It is much more likely that they are manmade and the big sinner is the burning of fossil fuels Read more here
ANS: It is much more likely, that they are manmade, and the big sinner is the burning of fossil fuels. (Read more here.)

QUESTION: Fix punctuation: Registration 28 July 2005 1044
ANS: Registration 28 July 2005 10:44

QUESTION: Fix punctuation: This en suite room has a flatscreen TV and tea and coffee making facilities
ANS:
This en suite room has a flat-screen TV and tea and coffee making facilities.