A、Good morning
B、See you
C、Welcome back to school
A、Hello
B、Good morning
C、See you
A、Hi,Good morning
B、Nice to see you
C、Hi,I;m Betty.I am from the USA
B、Ok
C、Welcome
B、Nice to meet you
A、Welcome back
B、Welcome
C、Where are you from
A、Thank you
A、What's your name
B、Where are you from
A、Nice to meet you
B、Hi
C、See you tomorrow
D、Wait a moment