选择in, on, of, to, for, from填空，完成对话。

1. A: May I speak ______________ Miss Green?

    B: Sorry, she's not in.

2. A: Tom, this new shirt is ______________ you.

    B: Thank you, Mum.

3. A: Excuse me, where's the classroom ______________ Class One?

    B: Room 201.

4. A: Are you ______________ Beijing?

    B: No, I'm not.

5. A: What's ______________ the letter box?

    B: Many letters.

6. A: Are there any books ______________ the shelf?

    B: Yes, there are.