QUESTION: Fix punctuation: Tip Incorrect D01 file association errors can be a symptom of other underlying issues within your Windows operating system
ANS: Tip: Incorrect D01 file association errors can be a symptom of other underlying issues within your Windows operating system.

QUESTION: Fix punctuation: The tree line further down the farther north one goes Birch forest mountain birch forest grows around the tree line
ANS: The tree line further down the farther north one goes. Birch forest: mountain birch forest grows around the tree line.

QUESTION: Fix punctuation: 10 smartphones including the new BlackBerry Mini Stereo Speaker as well as a variety of carrying and charging solutions including a unique charger that
ANS: 10 smartphones, including the new BlackBerry® Mini Stereo Speaker as well as a variety of carrying and charging solutions including a unique charger that

QUESTION: Fix punctuation: Athletes and recreation enthusiasts may use numerous playgrounds facilities and equipment for all kinds of sports on the ground and in the sea The tennis camp has nine clay courts one colour set court and two lighted indoor clay courts
ANS:
Athletes and recreation enthusiasts may use numerous playgrounds, facilities and equipment for all kinds of sports on the ground and in the sea. The tennis camp has nine clay courts, one colour set court and two lighted indoor clay courts.