Before Father's Day, I found my father was unhappy because he was out of work. I decided to cheer him up by ____(buy) him a special Father's Day gift.

    Amy's Store is ____(popular) gift shop near our school. It ____(know ) for fashions and styles. This was the ____(one)time I entered the shop, so I told Amy that I ____(look) for a Father's Day present. She helped choose a Swiss watch ____ looked nice. I told her I only had 11 dollars in a low voice.

    "You're so lucky, " she told me, "It's only $10. You still have$1 for the card." She packed the watch and said my father would take pride ____ me.

    When my father opened the gift, he asked, "Where did you get it?"

    "I bought it at Amy's Store. It cost me $10, "I said. ____ surprised my father looked!

    Many years later, I learned the ____(true ) that the watch was worth 100 dollars, and I appreciated(感激)how kind Amy had been to ____(I).I always regret that I never had a chance to thank her.

已知：R₁COOR₂+R₃OH $\stackrel{一定条件}{\to }$ RCOOR₃+R₂OH