Audio 10
Doomo sumimasen.
Iie.
Audio 9
Onegaishimasu.
Hai.
Audio 8 Prof. says:

Oyasumi.
Student says: Oyasumi nasai.
Audio 7
Konbanwa.
Konbanwa.
Audio 6
Hajimemashite..
Hajimemashite..
Audio 5 Prof. says:

Ohayoo.
Student says: Ohayoo gozaimasu.
Audio 4
Ii otenki desu ne.
Ee (or Hai), soo desu ne.
Audio 3
Ohisashiburi desu ne.
Shibaraku desu ne. Or Ohisashiburi desu ne.
Audio 2
Arigatoo gozaimasu.
Iie. or Dooitashimashite.
Audio 1 Prof. says:

 Ja mata..
Student says: Sayoonara. or Shitsuree shimasu.