question: the result was an, in the context of history, so far exceptional murder of millions.
Capitalize this past sentence correctly.
A: The result was an, in the context of history, so far exceptional murder of millions.

question: potential for further savings in energy consumption for the various materials, calculated in pe (person equivalents)
Capitalize this past sentence correctly.
A: Potential for further savings in energy consumption for the various materials, calculated in PE (person equivalents)

question: notice, that you have to select cells in 2 columns.
Capitalize this past sentence correctly.
A: Notice, that you have to select cells in 2 columns.