Fill in: is or are 11. Her advice _____ very interesting. 12. Mathematics_____ his favourite subject. 13. Measles_____ a common illness. 14. The glasses_____ on the table. 15. My sister’s hair_____ long. 16. Their bathroom scales_____ quite accurate. 17. Darts _____ a popular game in Britain. 18. This work_____ too hard. 19. People_____ unhappy with the new tax system. 20. The police_____ near.