Heh, well, normally from my experience...most people don't actually go to buy the book until the first week of classes is already over. :D But it's good of you to want to be so organized. Definitely e-mail your teacher, he'll probably be impressed with you getting a jump on things.
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So when you're happy (Hurray!), or sad (Aw!),
Or frightened (Eeek!), or mad (Rats!)
An interjection starts a sentence right.