口语运用：从方框中选择正确的句子补全对话。(10分)
A.Who is the girl?
B. She is my sister, Nancy.
A. 
B.She is eleven.
A: Does she have a wide mouth?
B： She has a small one.
A: Is she a student？
B:    She is in Grade Seven.
A: Who is the boy next to her?
B: He is Nancy’s good friend, Jack. He is in Grade Seven, too.
A:   
B: He is twelve years old.
A:   
B: They are blue.