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Use prepositions where necessary to complete the sentences1)it is impossible elephants to fly.2) my parents introduced me their guests.3) we have two good seats the stalls.4)the audience laughed and applauded the actors.5)his answer impressed me.6)we bought a new tv-set half price.7)do you think john will agree the plan? 8)you should pay attention what your teacher says.9)my uncle graduated oxford in 2014.10)the story was based real life.