Listening 9. (No. 29~30)
https://www.youtube.com/watch?v=SF4srUqxnfw&list=PL6D-YTosvGYq8YexsOG53BGav1CD0t3aM&index=22
Listening 10. (No. 31~32)
https://www.youtube.com/watch?v=oCcNgO4qMm8&list=PL6D-YTosvGYq8YexsOG53BGav1CD0t3aM&index=23