Directions: There are 15 blanks in the following passage. For each blank there are for choices marked A ,B ,C and D. You should decide on the best choice to complete the passage. One summer, when I was little, my dad built me a lemonade stand(柠檬水摊位). On sunny days I'd 1 the stand outside the local car wash with a cooler and my little black safe(保险箱). I didn't get many customers 2 I always had fun. One 3 I did have was an elderly gentlemen who lived across the street from the car wash. He would come every day and 4 a glass of lemonade for his wife. Even though I only 5 25 cents, he always paid 6 with a $1 Sacagawea coin. So I built up quite a collection by the end of that 7 ! Now, as a college student, I make it a 8 to stop at as many lemonade stands as I can, always paying more than the kids charge me. This has been going on for 9 three years now. But this week, I didn't have any 10 with me when I stopped at a little girl's stand. I 11 around in my car frantically(疯狂地)and finally opened up one of my boxes. I opened it up and sure enough, there were my Sacagawea coins. I almost shut the lid(盖子)again because they 12 so much to me, but then I realized that that was 13 why I had to pay with the coin. When I gave that young girl the shiny gold coin, I said "You should keep this one, they don't make them anymore!". And her 14 lit up. As I drove away, I saw her running to her sister to show her the 15 and I knew that I had made her just as happy as I was when I was a little girl.