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

QUESTION: Fix punctuation: RfD Reference dosis RfD is an oral reference dosis based on the assumption that a threshold limit for certain toxic effects exists
ANS: RfD: Reference dosis. RfD is an oral reference dosis based on the assumption that a threshold limit for certain toxic effects exists.

QUESTION: Fix punctuation: In the early morning it will be mostly cloudy Before noon clouds with light rain will dominate The evening will bring variable clouds with isolated rain showers
ANS: In the early morning it will be mostly cloudy. Before noon clouds with light rain will dominate. The evening will bring variable clouds with isolated rain showers.

QUESTION: Fix punctuation: Your treatment will depend largely on the stage you are with the disease
ANS:
Your treatment will depend largely on the stage you are with the disease.