When I was 19，I had got a job in my local bookstore. Living in the large city，I usually saw many strange customers(顾客)，most of 1 were teenagers. They didn’t e often；I forgot all the customers 2 two. One night a 15-year-old girl came in looking for a book with a boy. They seemed to find what they wanted to buy. But 3 they came to the counter（柜台），the girl found she was a dollar or two short to buy the book，and she took
4 all her money to prove it. She looked so disappointed. Just then I remembered my discount card and 5 was still active，so I told the girl 6 to worry. I put in my code（密码），being happy that I could help them with this card. With the book in her hand she gave me 7 thankful smile，and then she and the boy got out of the store happily，leaving me feeling content，too. 8 fact, sometimes a little thing can also make one’s world beautiful.
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解析：
【小题1】这是一个定语从句，构成“名词 / 代词 + 介词 + 关系代词”结构，关系代词在从句中作主语，且是人，故只能用whom
【小题2】这里表示除了两个顾客，其他的顾客我都忘记了，故用but/ except
【小题3】这是一个时间状语从句，表示“当……时候”，故用when
【小题4】take out 是固定短语，意思是拿出，取出
【小题5】指代前面的“my discount card”，故用it
【小题6】固定句型：tell sb. not to do sth，告诉某人不要做某事.
【小题7】表示泛指“一个微笑”，且“thankful”首字母发音是辅音，故用不定冠词a
【小题8】in fact固定短语，意思是事实上。