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

QUESTION: Fix punctuation: Hold on tight Frede Fr has been mischievous and painted big red targets on the rumps of all the bulls so they are now chasing each other wildly round and round and round
ANS: Hold on tight! Frede Far has been mischievous and painted big red targets on the rumps of all the bulls, so they are now chasing each other wildly - round and round and round.

QUESTION: Fix punctuation: Some ACAD file extension formats can be opened in binary format only
ANS: * Some ACAD file extension formats can be opened in binary format only.

QUESTION: Fix punctuation: His first and only appointment was to University College London
ANS:
His first and only appointment was to University College, London.