Listening 13. (No. 37~38)
https://www.youtube.com/watch?v=sn3kaBiLkTg&list=PL6D-YTosvGYq8YexsOG53BGav1CD0t3aM&index=26
Listening 14. (No. 39~40)
https://www.youtube.com/watch?v=iP5x9k717g8&list=PL6D-YTosvGYq8YexsOG53BGav1CD0t3aM&index=27