Enter ZamZar. You simply upload the file you want converted, select the desired format, enter your e-mail address, and click "convert." ZamZar automatically e-mails you when the file is done. That's it - no downloading software, and no programs to purchase.
I sent a pdf file that included simple graphics, and PDF to Word sent the conversion to my email in less than two minutes, and the graphics were in the same place and as the same quality as the pdf original.
Give PDF to Word Converter or ZamZar a try! They're both great teacher time-savers, and they're free!