She had just finished her homework           her mother asked her to practice playing the piano yesterday. 
#30926
A
when
B
while
C
after
D
since
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The students of the music school study ____. 
#31664
A
music but also some other subjects
B
some other subjects as well as music
C
no subjects but music
D
neither music nor some other subjects
27. She locked her room _____ a thief would break into it.
#79728
A
in case that
B
for fear that
C
in case of
D
for fear of