At school，some students are active ________ some are shy，yet they can be good friends with one another.
#30233
A
while
B
although
C
so
D
as
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Trust is needed in the whole society, which requires parents to obey their own rules and set a good example _______ children can trust them.
#30655
A
soon after
B
as if
C
in case
D
so that
It is an unfair thing for our students____ have devoted 12 years to preparing the exam to be beaten by those_____ use illegal methods..
#32815
A
who; 不填
B
不填，who
C
who，who
D
不填，不填
Please keep the windows closed _____________ it rains.
#31827
A
in case of
B
in that case
C
in no case
D
in case