文本：
Lesson 21 Bone
1. Get up, you lazybones.
2. Step aside, you bag of bones.
3. He's always boing hard before exams.
4. The cake is as hard as a bone.
5. I'm frozen to the bone.
6. He has a bone to pick with me.
7. I make no bones about that.
8. Ho loves me, I feel in my bones.