Ⅰ
⑴his is Liu Tao.
⑵Good morning!
⑶Are you Mike?
⑷Goodbye, Tim.
⑸She's my sister, Helen.
Ⅱ
A. Hello, Liu Tao.
B. No, I'm not.
C. Good morning!
D. Hi, Helen!
E. Goodbye.
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