[MelissaC]

Hello Toby!
God knows how many times I've run into this problem before. There are MANY different activities and games one can play for warm-up. What Ralph suggested was perfect! Another SIMPLE game is, say, writing the worlds longest word on the board and asking the students what they think it might mean. You could also write a few tongue twisters down and have the students read them. Adults in groups LOVE the latter.
What I've found works best is having an open discussion about the latest stories in the news. I usually bring in that mornings news, or the one from yesterday which gives me more prep. time, copy a small article for the students, then have them read it. It gives the students a chance to wake up, learn new words, and adults ALWAYS want to know the latest news. The love to have the chance to speak with a native about it.
Good luck!
Melissa