answers:
A. Mr. Keynes was a workaholic who found vacations as relaxing as six rounds wrestling with an alligator.
oxymoron:
"vacations as relaxing as six rounds wrestling with an alligator"
D. Although he didn't want to, Mr. Keynes took his laptop along with his bathing suit and other holiday clothes because this was a working vacation.
oxymoron:
"working vacation"
definition of oxymoron:
noun
"a figure of speech in which apparently contradictory terms appear in conjunction."