The preposition is 'I' I think. I could be wrong.
1. . METAPHOR- "Richard DRUMMED his fingers on the arm of the chair waiting for his name to be called."
2. PERSONIFICATION -“Richard drummed his fingers on the ARM OF THE CHAIR waiting for his name to be called."
3. ONOMATOPOEIA-“The WHIRRING of the drills increased his anxiety, but he held his head high with a sort of cowardly courage."
4. ALLITERATION- "The whirring of the drills increased his anxiety, but HE HELD HIS HEAD HIGH with a sort of cowardly courage."
5. OXYMORON- "The whirring of the drills increased his anxiety, but he held his head high with a sort of COWARDLY COURAGE”
6. SIMILE- “RICHARD BRUSHED AND FLOSSED HIS TEETH LIKE A CLOCKWORK to avoid the wrath of the dentist’s tools, so the news that he had four cavities certainly took him by surprise."
7. PERSONIFICATION -"Richard brushed and flossed his teeth like clockwork to avoid THE WRATH of the dentist’s tools, so the news that he had four cavities certainly took him by surprise."
