I have completed lesson 8 aproximadamente ten times (I'm having a little problem getting aproximadamente sixty adverbs memorized). The lesson outline that comes up when you go to adverbs for the first time lists INMEDIATAMENTE at the top of the list of NEW words. After working through this lesson aproximadamente ten times, the word INMEDIATAMENTE has never appeared. WHY? As mslade81 states 'duolingo is not perfect' but this is the first time (in my experience) that a word has been overlooked.