I believe the answer is woman ^^
<span>He was working as an engineer in Switzerland at the time.
"Was working" is past progressive. </span>
They live in mountainous areas
Third person plural pronoun is THEY.
If you want to create a possessive pronoun out of that one, that would be THEIRS.
Possessive pronouns, as the name itself says, determine some kind of possession. For example:
Is this books yours? - No, it's theirs.
