Things do happen during a _schoolreis. . The _{bus, touringcar} may be late because the _buschauffeur overslept, but once you are at the _toegang of a _grot for example, the _gids will _{je rondleiden} .
You are not supposed to _{verstoppertje spelen} in a cave or to _{een poets bakken} on people. Otherwise you may _verdwijnen in the _grot for ever, which can be very _dramatisch , unless you _{voor de dag komen, opduiken} unexpectedly.
Some people lose the _horloge their _meter gave them, but _gelukkig you may also find a prehistoric _been , a _schedel or a _rib ; when you _verwijderen a _steen . This can prove to be _uiterst important for science.