--- Look at ______ book on the desk . Is it ______ useful one ?--Yes, it is . In the book there is much advice on how to learn math well.

--- Look at ______ book on the desk . Is it ______ useful one ?--Yes, it is . In the book there is much advice on how to learn math well.

#33474

a, the

the, a

the, an

a, an

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