question: there will also be a keysigning party and a dr. tux where users can ask questions about gnu/linux.
Capitalize this past sentence correctly.
A: There will also be a keysigning party and a Dr. Tux where users can ask questions about GNU/Linux.

question: home to high-street stores, london's popular oxford street is just 10 minutes' walk from the ashley hotel and marble arch can also be reached after a 10-minute stroll. paddington tube station has a direct link to heathrow airport, with a journey time of 20 minutes.
Capitalize this past sentence correctly.
A: Home to high-street stores, London's popular Oxford Street is just 10 minutes' walk from the Ashley Hotel and Marble Arch can also be reached after a 10-minute stroll. Paddington Tube Station has a direct link to Heathrow Airport, with a journey time of 20 minutes.

question: we employ a phased modular architecture to optimise power usage effectiveness, and we operate to the highest energy efficiency standards
Capitalize this past sentence correctly.
A: We employ a phased modular architecture to optimise power usage effectiveness, and we operate to the highest energy efficiency standards