Pre-intermediate listening comprehension

These are the recordings from unit 3 revise & check.

3.20

[audio="http://www.ivoox.com/nef-pre-intermediate-3-20_md_988893_1.mp3"]

3.21

[audio="http://www.ivoox.com/nef-pre-intermediate-3-21_md_988894_1.mp3"]