- A. Must I buy this book or that book?
B. You must buy that book.
A. Why?
B. it’s more interesting. - A. must I put on this dress or that dress?
B. you must buy this dress.
A. Why?
B. it’s more beautiful. - A. Must I buy the red or the green coat?
B. You must buy the red coat.
A. Why?
B. It’s prettier. - A. Must I buy these gloves or those gloves?
B. You must buy those gloves.
A. Why?
B. They are warmer.