Explanation:

- The passage revolves around the importance of taking timely and correct actions to rectify errors.

- The saying 'A stitch in time saves nine' implies that acting promptly can prevent bigger problems later.

- Blank (1): The word before "action" should describe an action taken on time and effectively.

- Superficial: Not deep or thorough, often inadequate for what is needed.

- Wrong: Incorrect or faulty, not suitable for a positive outcome.

- Appropriate: Suitable, proper under the circumstances for the desired effect.

- Opposite: Completely different; this does not fit the context as it does not pertain to timeliness or correctness.

Given the context, the word "appropriate" is the most relevant as it describes a suitable and timely action.

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