The radio club often plays songs _______by students and gives messages to keep parents ____ of the latest news.       
#93244
A
sung, exchanged
B
sang, broadcasted
C
singing, approved
D
sung, informed
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Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.
#98906
A
upon which to base
B
which to be based on
C
which to base on
D
to which to be based on
They couldn’t stand        like that.
#94446
A
be treated
B
to treat
C
treating
D
being treated