6. The people next door **have gone** hiking every weekend in the summer.
- A. have gone

7. My father and mother **work** for the same company.
- A. work

8. Most of the mountain peaks in the Himalayan range **are covered** with snow the year around.
- C. is covered

9. The United States of America **consists** of fifty separate states.
- B. consists

10. Two hours **is** too long to wait, don't you think?
- A. is

11. A lot of Brazilians **speak and understand** Spanish.
- A. speak and understand

12. Why **are** the police standing over there?
- B. are

13. Geography **is** fascinating. Mathematics **is** fascinating.
- A. is - is

14. The most common name for dogs in the United States, **is** "Roger".
- A. is

15. Several theories on this subject **have been proposed**.
- D. have been proposed

16. Mr. Robbins, accompanied by his wife and children, **is arriving** tonight.
- C. is arriving

17. Writing many letters **makes** her happy.
- B. makes

18. The number of days in a week **is** seven.
- A. is