Listening 3. (No. 7~10)
https://www.youtube.com/watch?v=J99aIZtuEzI&list=PL6D-YTosvGYq8YexsOG53BGav1CD0t3aM&index=33
Listening 4. (No. 11~14)
https://www.youtube.com/watch?v=0aOx5XQb0FU&list=PL6D-YTosvGYq8YexsOG53BGav1CD0t3aM&index=34