Field Trip Slacking

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It's the new school year and Sarah's class are going on a field trip to a museum! That sounds like more fun than just studying books and Sarah can't wait to check out the dinosaur displays and exhibits. But Sarah's strict teacher is tagging along and and she just loves to catch naughty students messing around and slacking... Will Sarah be able to outwit her teacher and have a great time at the museum? Or will her slacking days be put back into the prehistoric era?