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一Whose watch is lost?

一Mr．Smith’s．Look ! He ________it everywhere．

A．looked for     B．was looking for       C．looks for           D．is looking for

—Whose violin is this?

—It _____be Amy's．She plays the violin．

A．can't                  B．might            C．will                    D．mustn't

一Whose notebook is this?

一It       be Carla’s．It has her name on it．

A．might           B．must             C．shouldn’t               D．can’t