Expedient in this excerpt means for something to be appropriate to a purpose.
Answer:
a brief statement or account of the main points of something.
Explanation:
it means to sum everything u learned in a book or sum
I think it is C, because if I'm right present principal is something that is happening presently? If so, C would be the answer because they "are doing" the exercises right now in context.
Answer:
It means you are unaware of something
Explanation:
She unwittingly walked in the wrong house
