I knew ___
__(少) about English when I first came to America. So I went to a __
___(语言)school every day to learn English. One day, ___
__(在…期间the break, I asked one of my____
___(同班同学) a question that I didn't understand. When I ____
____(感谢) her for it, she said, "You are welcome. It's a piece of cake." I thought to __
____(自己); America is really a society for money. ___
___(一切)is done for pay there. So I said to her, "I haven’t _
___(拿来)any piece of cake with me today. What about a piece of biscuit?" She looked at me in ___
____(惊讶), then smiled. Then she realized that I hadn’t understood her. She said, "What I mean is 'no problem'. "Then I came to learn that "a piece of cake" is not only a piece of cake, but also means a thing that is very __
____(容易).