"His or her" would technically be the best fit, since it is acknowledging both genders, but it is very common to use "their" any most people wouldn't consider it wrong. <span />
1. Alliteration
2. Oxymoron
3. Imagery
4. Personification
5. Simile
6. Metaphor
7. Onomatopoeia
8. Foreshadowing
I hope this helps
Uttering words in a low tone. Like if talking by to themselves.