The correct answer is Option (2) → off and on
- "Off and on" means intermittently or sporadically.
- In the sentence "He worked ten years, _____ on his Pale Dictionary," it suggests that his work on the dictionary was not continuous but done at intervals over a long period.
- The other options do not convey this meaning:
- Far and near: Refers to a range of locations, not time intervals.
- Once and again: Although it implies repetition, it is not a standard idiom for intermittent work.
- Far and away: Is used as an intensifier to mean "by a large margin" and doesn't fit the context.
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