question: the exercise is to mix raw materials to a desired chemical composition.
Capitalize this past sentence correctly.
A: The exercise is to mix raw materials to a desired chemical composition.

question: the incredibles:thin ice frozone has bought a super winter suit that allows him to slip more easily on ice. snow means fun!...
Capitalize this past sentence correctly.
A: The Incredibles:Thin Ice Frozone has bought a super winter suit that allows him to slip more easily on ice. Snow means fun!...

question: relative humidity: 51 %
Capitalize this past sentence correctly.
A: Relative humidity: 51 %