Final answer:
The phrases “tasted of desire” and “enough of hate” in Robert Frost's poem “Fire and Ice” best showcase the speaker's internal conflict between two potent emotions and their destructive capabilities.
Step-by-step explanation:
The words or phrases in the poem “Fire and Ice” by Robert Frost that best show the internal conflict are “tasted of desire,” which suggests a personal experience with strong emotions that can lead to destruction, and “enough of hate,” indicating a familiarity with another powerful emotion that can also cause ruin. This internal conflict is embodied in the speaker's contemplation over whether fire or ice would be a better agent for the world's end. The speaker's personal experiences with both “desire” and “hate” inform their understanding of the potential destructive power of these elements, mirroring the broader themes of passion and loathing.