Final answer:
The subject of this question is English, and the grade level is High School. The correct answer is pain, as pain and hardship can help individuals build strength.
Step-by-step explanation:
The subject of this question is English.
The grade level of this question is High School.
In the given sentence, the word 'strength' suggests that the question is related to personal growth and character development.
The correct answer to fill in the blank is pain because pain and hardship can help individuals build resilience and inner strength.
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