选择合适的选项，补全对话。
Amy: Hello!
1．Tom: Hi, Amy, this is Tom.
2．Amy: I'm learning English.
Tom: You're so hard-working (工作努力的).
3． Amy: She's singing in the room.
Tom:
4．Amy: They're in the sitting room.
Tom:
5．Amy: Yes, they are. I'm going to the bookshop tomorrow. Let's go together, OK?
Tom: Great!
| A．What's your little sister doing? |
| B．Are they watching TV? |
| C．What are you doing now? |
| D．Where are your grandpa and grandma? |
| E．It's Amy here. |
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