Answer:
As Pete and Malia headed out the door on their way to the convention, they almost forgot the money they would need to get in there.
They were very excited to buy the latest edition of their favorite comic book by their favorite author.
Step-by-step explanation:
Homophones are words that are pronounced the same way but have different meanings (and sometimes spelling).
In the first sentence, there are two homophones: their and there. Their is a word used to describe that something belongs to them (Pete and Malia's way - their way). There is the opposite of here and means at that place (get into the convention - get in there).
The second pair of homophones is buy and by. To buy is a verb that means to purchase something. By is a preposition used to state who is performing a certain action (a comic book by their favorite author - their favorite author wrote the book they are buying).