Please capitalize where necessary: everyone is invited to help, in the good spirit of free software.
A: Everyone is invited to help, in the good spirit of Free Software.
Q: here is a selection of the most popular magnifiers for the healthcare sector.

A: Here is a selection of the most popular magnifiers for the healthcare sector.
Q: 5. if you do not want to accept cookies, you can change the settings of your web browser‘s security.
A: 5. If you do not want to accept cookies, you can change the settings of your web browser‘s security.
Problem: 28.09 diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined
Can you repeat this sentence, but capitalize it?
Answer: 28.09 Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined
Text: worldwide most visited independent site for booking language courses, russian lessons & russian language classes & russian language study abroad programs at russian schools in russia.

Correct capitalization: Worldwide most visited independent site for booking language courses, Russian lessons & Russian language classes & Russian language study abroad programs at Russian schools in Russia.
Problem: the residential complex testifies to the endeavours of the developer to create individual and personal living space even when constructing multi-storey apartments.
Can you repeat this sentence, but capitalize it?
Answer:
The residential complex testifies to the endeavours of the developer to create individual and personal living space even when constructing multi-storey apartments.