Using audio material in class has a number of advantages and disadvantages. Write "A" for advantage and "D" for disadvantage. Then choose the alternative that displays the correct sequence.

( ) Audio material is portable.
( ) Everyone has to listen at the same speed.
( ) Learners are prevented from interacting with the speakers.
( ) Audio material provides a variety of different voices and situations.
( ) Listening to a CD player is not a natural occupation.