QUESTION: Fix punctuation: A lack of trust wafted through the Copenhagen air when negotiators gathered at Decembers United Nations climate summit
ANS: A lack of trust wafted through the Copenhagen air when negotiators gathered at December’s United Nations climate summit.

QUESTION: Fix punctuation: The functions of CRAtoolbox have been customized to match clinical research needs
ANS: The functions of CRAtoolbox have been customized to match clinical research needs.

QUESTION: Fix punctuation: Where no age limit is specified the general age limit of 6 years old applies
ANS: Where no age limit is specified, the general age limit of 6 years old applies.

QUESTION: Fix punctuation: Glass thickness 4  19 mm
ANS:
Glass thickness 4 - 19 mm