Answer:
Metaphor - charcoal gown, her four years of school had reached the final chapter
Simile - placed the cap on her head like a crown
Onomatopoeia - cracked
Personification - the words leapt off the paper, time had flown by
Oxymoron - bittersweet
Alliteration - celebrating her success as a star student, she would also be saying so long; mentioned many of the marvelous memories they made
Step-by-step explanation:
All of these terms refer to different figures of speech.
Metaphor and simile are both used to compare two things. A metaphor compares things that aren't too similar but have something in common (charcoal gown - a gown as dark as charcoal). This comparison is more subtle than a simile, which involves the use of words like and as (place the cap on her head like a crown).
Onomatopeia is a word that sounds just like the thing it is describing. In the given passage, this is the word cracked.
Personification is the attribution of human characteristics to something non-human (words leaping off the paper, time flying by).
Oxymoron refers to a combination of contradictory words (bittersweet is an example of one word oxymoron).
Alliteration is the repeated use of words that begin with the same sound (mentioned many of the marvelous memories they made).