第二节 语法和词汇知识 （共15小题；每小题1分，满分15分）
6. —It’s getting dark. My son hasn’t returned home?
—______He has been a grown-up.
A. Take it easy. B. No problem. C. Take your time. D. So what?
7. ______her cat might make her bed dirty, she still keeps and cares for it .
A. Unless B. Because C. Even though D. So long as
