Do you have extra time after your lesson and not sure what to do?  Use an alphabet bag.  How you make them is up to you, but here is the basic idea.  Print off these alphabet letters (and possibly laminate).  Place the letters in a bag of some kind.  It could be as simple as a Ziploc baggie or it could be a sewn cloth bag with a drawstring.  Anyway, place all the cards in the bag and when the lesson is over you call the first child up and ask them to draw a letter out of the bag.  Let's say they draw the letter "C".  Tell me something we've spoken about today that starts with the letter, "C".  You can set up your own rules on how you want to play exactly, if the whole class can help or if you keep points, etc.