1.I have a sweet tooth....
我爱吃甜食。

2.have your cake and eat it: 吃掉蛋糕同时又保有它。两全其美的事儿，好事成双
Usually you can't have your cake and eat it.
鱼与熊掌不可兼得

3.the icing on the cake＝a cherry on top 锦上添花，英文里面呢，我们讲蛋糕上的糖衣，或者刚刚我讲的那个，冰淇淋顶上的一个樱桃。
My new boyfriend is very intelligent. That he is handsome is just the icing on the cake.
我的新男朋友很聪明。然后他还很帅气，真是锦上添花。

4.as American as apple pie: 非常地道美国式的

5.be in apple-pie order 像苹果派一样，形容井然有序，整整齐齐

6.as flat as a pancake: 像薄煎饼一样平坦，又平又薄。特别地，形容女生的时候，表示，平胸。
Look at that girl. She is as flat as a pancake.
看那个女孩子，胸好平。

7.That's the way the cookie crumbles. 事已定局，无可变更
We lost the game, but that’s just the way the cookie crumbles.
我们输了比赛，但是事已至此，只能这样了。

8.something is selling like hot cakes. 某物热销，畅销，卖得很好。

9.a slice of cake 分一杯羹