1. Cat got your tongue?
2. He drives me crazy.
3. She is green with envy.
4. This cheese cake is head and shoulders above that one.
5. You hit the nail on the head on that!
6. You're on thin ice.
7. They are shaking in their shoes.
8. That's only a pipe dream.
9. She is definitely full of herself.
10. She's not giving me the time of day.
11. He's a goody-goody.
12. You scratch my back and I'll scratch yours.