(
)Oh,yes,it is .It's in the desk. Thank you.
(
)No, it isn’t
（
）That’s all right
（
）Excuse me, where’s my ruler? Do you know?
（
）No, I can’t see it
（
）Is it in your math book
（
）Oh, sorry, I don’t know. Is it in your pencil case?
（
）Is it in your desk
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