12. Mr. Green is a small (big) potato. 格林先生是个小（大）人物。

13. His statement must be taken with a grain of salt. 他的话不能全信。 

14. I'm afraid he is in the soup. 恐怕他有麻烦。 

15. It's another cup of tea. 那是另一回事儿。 

16. When she stays at home, she feels like a vegetable. 当她呆在家里时，觉得生活太单调。