Please capitalize where necessary: overnight in the united states, more than 100 security researchers and computer science experts have had to ensure the integrity of american state and federal elections.
A: Overnight in the United States, more than 100 security researchers and computer science experts have had to ensure the integrity of American state and federal elections.

Q: if you decide to choose one of these cats, be sure to have your pet tested for neuromuscular problems.

A: If you decide to choose one of these cats, be sure to have your pet tested for neuromuscular problems.

Q: the person who comes in second only gets half of the person coming in first and so on.
A: The person who comes in second only gets half of the person coming in first and so on.

Problem: if they come into contact with some kind of particle, a reflex is triggered causing the well-known, violent, jerky expirations from the lungs supposed to remove phlegm and other irritants.
Can you repeat this sentence, but capitalize it?
Answer: If they come into contact with some kind of particle, a reflex is triggered causing the well-known, violent, jerky expirations from the lungs supposed to remove phlegm and other irritants.

Text: there is a refrigerator as well as a big freezer in the apartment.

Correct capitalization: There is a refrigerator as well as a big freezer in the apartment.

Q: this information is private and cannot be shown. jenny berg, f. persson (2-1921)
A:
This information is private and cannot be shown. Jenny Berg, f. Persson (2-1921)