12. There (be) at least one window in every room. 13. A lot of students in my class (speak) ___________ and (undrstand) ___________ Spanish. 14. The trousers Lan’s bought (not, go) ___________ best with her shirt. 15. The information she gave me (be not) ___________valuable. 16. The number of days in a week (be) ___________seven. 17. Either you or he (have) ___________to do the task. 18. Two years without a job (be) ___________too long to be. 19. Every girl and boy (be) ___________required to have certain immunizations before enrolling in public school. 20. Neither of John’s parents (be)___________ English.