Please capitalize where necessary: the european community and ospar are presently cooperating on concretizing prioritized endeavours against the substances that are of greatest significance as regards pollution of the marine environment.
A: The European Community and OSPAR are presently cooperating on concretizing prioritized endeavours against the substances that are of greatest significance as regards pollution of the marine environment.

Q: click here to download the e-book (epub)

A: Click here to download the e-book (epub)

Q: the color is green and the yardage is 400 meter to the skein. (800 meter pr 100 gram)
A: The color is green and the yardage is 400 meter to the skein. (800 meter pr 100 gram)

Problem: the principle of "guardian spirits" is a universal principle.
Can you repeat this sentence, but capitalize it?
Answer: The principle of "guardian spirits" is a universal principle.

Text: the 30.th of october 1941 the third and last attack on the lighthouse on mykines holm took place. this time 5 bombs were dropped, of which 4 hit the ground around the lighthouse, but fortunately none of these exploded.

Correct capitalization: The 30.th of October 1941 the third and last attack on the lighthouse on Mykines Holm took place. This time 5 bombs were dropped, of which 4 hit the ground around the lighthouse, but fortunately none of these exploded.

Text: he kept his rooms in the tower until his death, but gave up his college house, which he had never lived in. simson remained in good health until a few years before his death, during which period he had to employ an amanuensis to assist him in revising his geometrical writings.

Correct capitalization:
He kept his rooms in the tower until his death, but gave up his College house, which he had never lived in. Simson remained in good health until a few years before his death, during which period he had to employ an amanuensis to assist him in revising his geometrical writings.