选择恰当的单词,补全对话。 A. am B. are C. Goodbye D. morning E. too Xiaolong: Good morning, Xiaofeng. Xiaofeng: Good 1., Xiaolong. Xiaolong: How are you, Xiaofeng? Xiaofeng: I 2. fine, thank you. And how 3. you? Xiaolong: I’m fine, 4. Xiaofeng: Bye-bye, Xiaolong. Xiaolong: 5., Xiaofeng.