27. Some of the apples are bad ,___________?

26. Some of the water is not clean,___________?

25. Nothing is interesting,_______________?

24. Everything is all right, _____________?

23. Every is　 here ,___________?

22. Don't play on the road ,____________?

21. Open the door,__________?

20. He must　 have come here,___________?

19. He must　 have read the book,____________?

18. He must　 be at home ,___________?