question: in the project, proposals were prepared for environmental product declarations addressed to professional users and private consumers (environmental product declarations,working report no. 47, 1997).
Capitalize this past sentence correctly.
A: In the project, proposals were prepared for environmental product declarations addressed to professional users and private consumers (Environmental Product Declarations,Working Report No. 47, 1997).

question: most complete multiplayer mode: the game supports cooperative mode on all missions such as "destroying a target" or "investigation".
Capitalize this past sentence correctly.
A: Most complete Multiplayer Mode: The game supports cooperative mode on all missions such as "Destroying a Target" or "Investigation".

question: his paper on entire functions and zeta functions was awarded first prize.
Capitalize this past sentence correctly.
A: His paper on entire functions and zeta functions was awarded first prize.