What is the most appropriate answer?

Audio 10
Konbanwa
Konbanwa
Audio 9
Ohayoo
Ohayoo or Ohayoo gozaimasu.
Audio 8 (Student says)

 Ii otenki desu ne.
Ee, Soo desu ne.  Or Ee, ii otenki desu ne.
Audio 7 (Teacher says)

 Doomo.
Dooitashimashite.
Audio 6 (Teacher says)

 Oyasumi.
Oyasumi nasai.
Audio 5 (Teacher says)

 Ogenki desu ka?
Ee, Okagesama de. Genki desu.
Audio 4 (Teacher says)

 Shibaraku desu ne.
Ohisashiburi desu ne.
Audio 3 (Your friend says)

 Oyasumi.
Oyasumi.
Audio 2( Student says)

 Shitsurei shimasu.
Sayoonara. or Jaa, mata.
Audio 1 (Teacher says)

 Ohayoo.
Ohayoo gozaimasu.