1. an air of melancholy surrounded him
2. an air of melancholy surrounded him
3. the decree guaranteed freedom of assembly
4. Rose's parents emigrated to Australia
5. the patriots had to capitulate to the enemy forces
7. all ivory trafficking between nations is prohibited
8. they offer sacrifices to the spirits

I don't recommend using the first person pronoun in an argumentative essay. Unless your instructor suggests that you do so, omit it from the assignment because your writing will read better without it.
Alliteration is the answer