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1
a Good morning.
b Good afternoon.
2
a —Goodbye!
—Goodbye!
b —What's your name?
—My name is Liu Hao.
3
a —Hello, Bobby and Sam.
—Hello, Ruby.
b —Hello, Ruby and Sam.
—Hello, Bobby.
4
a —Good morning.
—Good morning.
b —Nice to meet you.
—Nice to meet you too.
a
a Good morning.
b Good afternoon.
2
b
a —Goodbye!
—Goodbye!
b —What's your name?
—My name is Liu Hao.
3
a
a —Hello, Bobby and Sam.
—Hello, Ruby.
b —Hello, Ruby and Sam.
—Hello, Bobby.
4
b
a —Good morning.
—Good morning.
b —Nice to meet you.
—Nice to meet you too.
答案：
a b a b
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