6. States______ political units.
A. is B. are C. was D. were
7. The United States______ in North American.
A. are B. is C. were D. was
8. Economics______ an important area of study.
A. is B. are C. was D. were
15. The English______ sometimes friendly people.
A. is B. are C. am D. be
16. Nearly 40 percent of the people in our town never______ in local elections.
A. voting B. to vote C. votes D. vote
19. Every one of the boys and girls in the school______ what to do if the fire alarm rings.
A. knows B. know C. to know D. knowing
20. ______ Portuguese spoken in Brazil?
A. not be B. am not C. isn’t D. aren’t
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