短文改错（共10小题；每小题1分，满分10分）
Many years ago, I step into a bookstore for some         76．      
books I wanted them. While I was there, I saw a young        77．      
boy of about 12 came into the store. The boy wanted 78．      
to buy a geography book. Geography books paid 79．      
one dollar every, but he had only 62 cents. I decided    80．      
to follow him to see whether he could succeed. Four    81．      
stores we entered, and four times he disappointed.      82．      
Luckily at the fifth store he got an used book for 50        83．      
cents. Having learned why he wanted the book, and    84．      
the bookseller gave him some writing papers and a      85．      
new pencil as a gift.