Question: The environmental guide part includes good advice before purchasing a review of the product categorys environmental impact from cradle to grave a review of the main environmental aspects to consider when purchasing in this product category and a checklist
Please fix the punctuation.
Fixed: [The environmental guide part includes "good advice before purchasing", a review of the product category's environmental impact from cradle to grave, a review of the main environmental aspects to consider when purchasing in this product category, and a checklist.]

Question: Due to instability Supermarine had to make extensive changes to the model before it was accepted by RAF Mk 21 was faster and climbed better that the Mk XIV but its flight characteristics were not as pleasant as the Mk XIVs
Please fix the punctuation.
Fixed: [Due to instability Supermarine had to make extensive changes to the model before it was accepted by RAF. Mk. 21 was faster and climbed better that the Mk. XIV, but its flight characteristics were not as pleasant as the Mk. XIV's.]

Question: Trace the outline as fast as possible and as accurate as you can
Please fix the punctuation.
Fixed: [Trace the outline as fast as possible and as accurate as you can.]

Question: Content can change based on the context
Please fix the punctuation.
Fixed:
[Content can change based on the context.]