I. Choose the best answer to complete each of the following sentences
1. A pilot is a person ………… flies a plane.
A. who B. he C. which D. whom
2. The boy ………… eyes are brown is my friend.
A. which B. whose C. whom D. who
3. The house, ………… he bought in 2000, is being repaired at the moment.
A. where B. that C. which D. what
4. He arrived late, ………… was annoying.
A. it B. that C. what D. which
5. Yesterday I met your brother, ………… had taken us to the Headquarters of the United Nations in New York before.
A. that B. who C. whose D. whom
6. Tears contain an antiseptic ………… helps protect our eyes from infection.
A. that B. what C. how D. where
7. Mr. Brown is the landlord ………… we rent the house.
A. who B. from whom C. whom D. whose
8. The United States consists of fifty states, ………… has its own government.
A. they each B. hence each C. each of which D. each of that
9. We are talking about the writer ………… latest book is one of the best-sellers this year.
A. who B. whose C. which D. whom
10. The factory in ………… John works is the biggest in the town.
A. where B. which C. that D. when