A piece of cake

1. Scott:
The homework is difficult.  I don't want to do it.

2. Miss Chu Chu:
Don't worry too much about it.  It's a piece of cake. I will teach you how to do it.

3. Scott:
 一件蛋糕？

4. Miss Chu Chu:
A piece of cake = 件事情很簡單， 很容易處理。