'Extensive' means wide-ranging or comprehensive, which fits perfectly with the context. 'Intensive' means concentrated and doesn't fit as well.

With 'neither...nor', the verb agrees with the nearest subject. Here 'teacher' (singular) is nearest, so 'was' is correct.

The passage clearly states AI has revolutionized 'industries from healthcare to finance' and adoption 'reached unprecedented levels', indicating widespread adoption.

'Data' is a plural noun (datum is singular), so it takes 'have' instead of 'has'. Correct: 'levels have increased'.

Logical sequence: First the location (3), then the discovery (1), then publication (2), then ongoing research (4).

'Contentious' means controversial or causing disagreement, which aligns with 'sparked considerable debate'. Other options don't fit contextually.

'Chasm' means a deep divide or gap, perfect for describing widened political differences. Other words suggest unity rather than division.

Subjunctive mood requires 'were' (not 'was') in 'if' clauses. With simple conditional, use 'would accept' not 'would have accepted'.

The passage presents 'increased productivity' (advantage) but also 'feeling isolated' (disadvantage), showing a balanced view.

'One of the reasons that' is correct. The verb should be singular 'was', not 'were'. The sentence structure: 'One...was' (correct with 'that').