Starter unit1
1b Listen and repeat. 听然后重复
Conversation 1 对话1
Bob:   Good morning, Helen!
Helen:  Hi, Bob!
Conversation 2 对话2
Cindy:  Good morning, Alice!
Alice:   Good morning, Cindy!
Conversation 3 对话3
Dale:      Hello, Frank! Hello, Eric!
Frank/Eric: Good morning, Dale!