- Changed exercise type from 'pattern_drill' to 'gap_fill' for improved clarity and engagement.
- Revised instructions to specify the use of the verb "adto" across different tenses, enhancing learner guidance.
- Updated question data format to include gaps for each tense, streamlining the exercise layout.
- Adjusted answer data to reflect the new gap-fill structure, ensuring consistency in exercise responses.
- Enhanced explanation to clarify the focus on tense variations with the verb "adto," improving educational value.
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