Natural English.: upper-intermediate class audio CD one.
Natural English intermediate.: class audio CD two.
Narural English.: upper-intermediate, class audio CD one.
Natural English.: upper-intermediate class audio CD two.
Natural English.: upper-intermediate, class audio CD two.
Natural English.: intermediate audio CD.
Natural English intermediate.: class cassette one.
Natural English.: intermediate student´s audio CD.
Natural English.: pre-intermediate, class cassette one.
Natural English.: upper-intermediate class cassette one.
Natural English.: upper-intermediate, class cassette one.
Natural English.: upper-intermediate student´s audio CD.
Natural English.: pre-intermediate student´s audio CD.
Natural English.: intermediate, cassette one.
Natural English.: pre-intermediate, class cassette two.
Natural English.: upper-intermediate class cassette two.
Natural English.: intermediate, cassette two.
Natural english.: upper-intermediate, class cassette two.
Netural English intermediate.: class cassette two.
Natural English intermediate.: class audio CD one.