Please capitalize where necessary: bright and spacious apartment of 100 m. in 2 double rooms can accommodate up to 4 people.
A: Bright and spacious apartment of 100 m. In 2 double rooms can accommodate up to 4 people.

Q: "we found that people who had been exposed to parental smoking when they were children had less elastic arteries, an early indicator of poor cardiovascular health," report the researchers in the mercury newspaper.

A: "We found that people who had been exposed to parental smoking when they were children had less elastic arteries, an early indicator of poor cardiovascular health," report the researchers in The Mercury newspaper.

Q: it's becoming rare to hear a new piece of music that truly enhances a special occasion.
A: It's becoming rare to hear a new piece of music that truly enhances a special occasion.

Problem: these data sheets are presented in pdf-format.
Can you repeat this sentence, but capitalize it?
Answer: These data sheets are presented in PDF-format.

Text: it is better to eliminate it together with cryptographic locker if you do not want to encounter other serious infections.

Correct capitalization: It is better to eliminate it together with Cryptographic Locker if you do not want to encounter other serious infections.

Q: of course there's nothing wrong with moving a lot or self-discovery, but is there a season in our early twentiesor even our teenswhen life doesn't really matter? should we hold off on all convictions, commitments, and seriousness until later?
A:
Of course there's nothing wrong with moving a lot or self-discovery, but is there a season in our early twentiesor even our teenswhen life doesn't really matter? Should we hold off on all convictions, commitments, and seriousness until later?