Question:
It annoyed Chris when Sebastian jangled his keys because he wanted to make fun.

he
Answer:
Sebastian
Question:
The sword was stuck in the tree because it was wedged in there really well.

it
Answer:
The sword
Question:
Intel sued IntelSpec since they happen to have a trademarked brand in their company name.

they
Answer:
IntelSpec
Question:
My brother put a Barbie that has metal parts in the microwave, so it does not work anymore.

it
Answer:
the microwave