Помогите пожалуйста
Use prepositions where necessary to complete the sentences



1)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.