- A. Must I buy this book or that book?
B. You must buy that book.
A. Why?
B. Because this book is more interesting. - A. Must I put on this dress or that dress?
B. You most put on this dress.
A. Why?
B. Because this dress is more beautiful. - A. Must I buy the red or the green coat?
B. You must buy the red coat.
A. Why?
B. Because the red coat is prettier. - A. Must I buy these gloves or those gloves?
B. You must buy those gloves.
A. Why?
B. Because they are warmer.
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