Fill in the Blanks PREPOSITIONSOnline version Fill in the gaps with the correct preposition by Elina Dimitriou 1 of on on front between behind next under A . Look at that beautiful bird ! Over there that tree ! B . The treasure is two big rocks . C . - I can't find my keys . - They are your bed , the pillow . D . - Which one is your house ? The one to that big playground . E . I sit between Mary and John at school . Mary is sitting in me and John me .