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-- Is tiffs your ruler? -- No, _________.
A. this is B. it isn’t C. it’s not
---Is this your ruler?
---No, it isn’t. It’s ________.
A．he’s B．her C．his D．she
—Is this your ruler?
—No, it isn’t. Oh, I think it must belong to _____________.
A. David B. David’s C. Davids D. Davids’