The girl         is singing an English song in the next room is Tom’s sister. 
#67223
A
whom
B
which
C
whose
D
who
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The hill ____ is covered with tress is called Huang Hill.
#68719
A
of which top
B
whose the top
C
whose top
D
top which
_______ you may have, you should gather your courage to face the challenge. 
#67911
A
However a serious problem
B
What a serious problem
C
However serious a problem
D
What serious a problem