1) Your directions didn't tell me exactly what to click -- since I don't really understand the arguments, I should be able to re-take the exam. Tell me what I missed in e-mail (while the exam is open) -- No, I can't come when you're available.
2) I've had a real family tragedy -- what do you suggest? Me -- incomplete, talk with me later -- go be with your family.
3) I have a horrific attendance record, but I've been in the hospital and am leaving a voice mail on Friday the last day of class. I'll be in class next week (it's finals week -- no regular classes) and want to make-up my work...call me back.