C. Time
When the speaker is saying “miles to go before I sleep”, sleep can refer to death. By saying that they have miles to go before death means that they still have time left to live.
Discipline is highly valuable in our every walk of life. ... Discipline is following the orders of our elders, superior officers, teachers and parents who lead us towards success. We need to follow rules, obey orders and behave well in orderly manner. We should value the importance of discipline in our daily lives
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The vocabulary used in the script