You will hear "on" in the following examples. Press the audio icon to hear the corresponding word.

French English
une maison Audio. Press to listen! a house
un garçon Audio. Press to listen! a boy
comprendre (*) Audio. Press to listen! to understand
un combat (*) Audio. Press to listen! a fight

note (*) that "on" before "p" or "b" is written "om".
However, there is one particular case: un bonbon Audio. Press to listen! (a candy/sweet).