21. We use forks and k       when eating in Western countries.

20. Their family is not rich,so they can't a      that expensive house.

19. Could you 1        me your dictionary? I'll give it back to you tomorrow.

18. There is nothing in the bottle. It's e      .

17. You've made a few grammar m       in your composition.

16. Don't w       the food. There isn't much left.

15. I'm a      that I can't get to the meeting on time.

14. Is the new teacher        (严格的) with the students?

13. ―Can we talk loudly in a movie theater? —No,we can't. It's        (不礼貌的).

12. Country music has been popular for over a       (世纪) .