读表格，选择正确选项完成对话，将序号填在横线上。
Ms Smart: How old are you, Ben?
Ben: I’m 1. ________.
Ms Smart: How old are you, Sam?
Sam: I’m 2. ________.
Ms Smart: How old are you, Tom?
Tom: I’m 3. ________.
Ms Smart: How old are you, Lingling?
Lingling: I’m 4. ________.
A. ten B. six C. eight D. nine
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