Answer:
1. My heart is broken into pieces Hyperbole
2. Fall fruits are my favorite Alliteration
3. Don't worry, I will be there in two seconds! Hyperbole
4. The world is your stage. Metaphor
5. I feel light as a feather Simile
6. His smile was a mile wide Hyperbole
Explanation:
Hyperbole is the unusual exaggeration of a word to make a point.
Alliteration is the repetition of the same letters at the beginning of closely connected words.
Metaphor makes an indirect comparison between two similar words.
Simile makes a direct comparison between similar words with the use of 'like', and 'as'.