Choose the correct verb, singular or plural, for each subject.
1. is 2. are 3. aren't
4. isn't 5. are 6. is
7. is 8. is 9. is...is...is
10. isn't 11. isn't 12. is
13. are 14. is 15. are
16. are
(Tài liệu tham khảo: Betty Schrampfer Azar. Understanding and Using English Grammar.3rd ed.)
Review exercise