Explanation:
I think the question is wrong. Sorry if I am wrong!
But It should have been "You cannot get a refund ________ sale goods."
In this case the answer should have been ON.
Anyway the answer is ON.
Wiglaf is presented as Beowulf's savior and helper. He is there to mentor Beowulf and is an important character in this excerpt.
Any source that distributes information to a large audience
The correct answer should be Katie insists that an office job would be less interesting than an outdoor job.
That is because this is an opinion of hers as someone might find it more interesting to work in an office, therefore insisting that it is the general truth is wrong.