Super dark, sorry
chomping at the bit
I should of studied grammar
I could care less
etc etc... there are tons of these in very common usage. A quiz on the subject would be cool.
I've also heard about Drake circumcising the globe before... with a large clipper.
I could also see someone mistaking ambitious for ambiguous more easily than ambivalent, at least if you're going with the "similar-ish sounding, different meaning" theme like you did with the rest of the words. Ambiguous and ambivalent share a meaning (sort of), the rest of the words does not share a meaning, just some phonetic resemblance.
And she COULD have been "ambiguous" about a job offer, if she were the one offering a job to someone...I had no idea what was needed here. Not a complaint, just a comment.
Good quiz though!
Shaun: What you mean?
Liz: Well, you guys hardly get on, do you?
Shaun: No, I mean, what does 'exacerbate' mean?
Liz: Um, it means to make things worse.