Fill in the blank with the correct relative pronoun

Ex1: Fill in the blank with the correct relative pronoun. 1. There are eighteen different kinds of penguins ______ live south of the equator.
A. whose
B. what
C. who
D. which
2. Thank you very much for the present ______ you sent me.
A. why
B. where
C. who
D. that
3. This is Mrs. Jones, ______ son won the championship last year.
A. which
B. who
C. whom
D. whose
4. His girlfriend, ______ he trusted absolutely, turned out to be an enemy spy.
A. that
B. who
C. whose
D. which
5. The bus crashed into a queue of people, four of _______ were killed.
A. them
B. that
C. whom
D. which