文本：
Lesson 15 Butter
1. At least it's my bread and butter.
2. Butter him up if you want it.
3. You're becoming a butterball.
4. She's a real butter fingers.
5. Come on!I'm no butter-and-egg.
6. Butter to butter is no relish.
7. Fine words butter no parsnips.
8. He knows where his bread is buttered.
