Please capitalize where necessary: the duo compliments each other eminently.
A: The duo compliments each other eminently.

Please capitalize where necessary: we do this because the price, especially when the trend is nearing its end, often not goes all the way up to the ceiling of the trend.
A: WE do this because the price, especially when the trend is nearing its end, often not goes all the way up to the ceiling of the trend.

Please capitalize where necessary: * personality disorders are grouped into clusters a, b, and c based on the dominating symptoms.
A: * Personality disorders are grouped into clusters A, B, and C based on the dominating symptoms.

Please capitalize where necessary: the entertainment features borrowed from this website offer a great alternative and complement passenger demand for use of internet, local organizing media content dedicated servers and installed on board trains.
A:
The entertainment features borrowed from this website offer a great alternative and complement passenger demand for use of Internet, local organizing media content dedicated servers and installed on board trains.