Suggested answer:
(1) The first line in which though has not been used as a conjunct is:
Though 1,800 people were involved in the redundancies it was...
(2) The function of though in the above example is that of subordinating conjunction
(3) Though as a linking adverbial is typically found in final or mid-position.
Example of though in final position:
The ham was very good though.
Example of though in mid-position:
The win, though, has put us right back in it.
(4) Though as a conjunct typically signals contrast.
Read about Linking adverbials here and here (Power Point file (see slides 9-12))
Terminology: conjunct