In the lost and found case:

A:Can I help you?
B:I can't find my ( )
A:Is it on the desk?
B:No,( )isn't.
A:Is ( ) your backpack?
B:No,it ( ).My backpack is( ).That one is small.
A;What about this one ? Is it ( )?
B:No ,( )is blue.This one is green.
A:How about that one over there?
B:Yes,( )is my backpack.look,it has my name ( )it.Thank you
very much.
A:You're ( ).

谢谢，很急，尽量快一点！~~·

backpack
it
this
isn't
big
yours
mine
it
on
welcome

backpack it that isn't yours mine it on welcome

①  where is his schoolbag？ ②are your friends  in the classroom？ 望采纳~~有问题追问。谢谢

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