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This is ______ key, and that is ________ orange.

A. a; a               B. a; an         C. an; an          

This is         key and that is           eraser.

             A. a, a     B. a, an       C. an, a       D. the, an

This is ______ key, and that is ________ orange.
A. a; a               B. a; an         C. an; an