A. Good morning, Mike.
B. Hi, Sam.
C. Good afternoon, Bobby.
D. Hello, I'm Mike.
⑴Hello, Mike. A. morning.
⑵Good afternoon, Su Hai. B. Gao.
⑶Hi, I'm Helen. C. Hello, Sam.
⑷Good D. Good afternoon.
⑸Miss E. Hi, I'm Tim.
—Good afternoon, Mike.
—Hi, Sam.
A. Good afternoon!
B. Hi!
C. Good morning!
D. Hello, Su Hai!