A. Is there; there is
B. Are there; there are
C. Is there; they is

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.