An important lesson that you can learn is that nothing can stay/ last forever, no matter how hard you work to make it last.
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Distrust:
disbelief
doubt
misgiving
wariness
Promote:
advertise
promote
Reassuring:
comfort
encourage
inspirit
Welfare:
benefit
well-being
The cat which, was white and fluffy,
D is the most appropriate thesis statement for a literary analysis paper. D explains the literary elements used along with a portion of the story's plot.