Final answer:
The sentence uses the words "passed" and "too" incorrectly. The correct words to use are "past" and "to".
Step-by-step explanation:
In the passed, we've always stopped at Niagara Falls on our way too Aunt Karen's house, but this year we won't have time.
The correct words to use in this sentence are "past" instead of "passed" and "to" instead of "too".
Corrected sentence: In the past, we've always stopped at Niagara Falls on our way to Aunt Karen's house, but this year we won't have time.
Learn more about Correcting words in a sentence