Question: Work less than 25 of the time in your country of residence for two employers with head offices in different countries one in your country of residence and one outside your country of residence
Please fix the punctuation.
Fixed: [Work less than 25% of the time in your country of residence for two employers with head offices in different countries, one in your country of residence and one outside your country of residence]

Question: 51 yo Cleveland United States
Please fix the punctuation.
Fixed: [51 y/o Cleveland, United States]

Question: Heat transfer theory helps explain practical aspects of how heat sinks work and can also help to clear up common misconceptions and design mistakes
Please fix the punctuation.
Fixed: [Heat transfer theory helps explain practical aspects of how heat sinks work, and can also help to clear up common misconceptions and design mistakes.]

Question: We currently have not any drugstore offered Ascorbic acid
Please fix the punctuation.
Fixed:
[We currently have not any drugstore offered Ascorbic acid.]