17. We must study hard,_____________?

16. There will be a film tonight ,___________?

15. There is no air or water on the moon ,_____?

13. Those books aren't yours ,____________?

12. This dictionary is dear ,__________?

11. The Green's have been to the Great Wall ____?

10.She' ll go to platy　 basketball ,__________?

9. Peter's　 going to see a film ,___________?

8. Let　 us have a rest ,___________?

7. Let's go out for a walk ,____________?