Sublingual, IV, IM, insufflation, Skin absorbtion, Plugging, inhalation, eye absorbtion, and of course, swallowing. Discounting Skin and eye absorbtion, youve got 7 so i would go with that.
Time. I wish I had more of it.
By collecting them all in one box at a time
Actually those do look correct which ones did you get wrong?
I think it is A. Stretch a note for longer than its normal time value.