:choose the correct articles a/an american car a/an university a/an mp3 player a/an taxi a/an old man a/an maths exam a/an exercise a/an hour

An American car,a university,a MP3 player, a taxi,an old man,a math exam,an exercise,an hour.

An American car
A university
A MP3 player
A taxi
An old man
A math exam
An exercise
An hour