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－ Whose is this blue bike?
－It ________ be Mary’s. Her bike is black and white.

－ Whose is this blue bike?

－It ________ be Mary’s. Her bike is black and white.

A．must             B．can’t            C．can              D．mustn’t

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—Is this your bag?  —_________.

A. Yes, it is       B. No, it is.    C. No, this isn’t     D. Yes. this is.

—Is this your bag? —_________.