A.to pay attention
B.paying attention
C.pay attention
D.your paying attention
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A.operated
B.made
C.run
D.done
A.which
B.what
C.that
D.whose
A.in the case
B.in any case
C.in no case
D.in case
A.come from
B.come in
C.come out
D.come up
A.where is the trouble
B.where does the trouble
C.where the trouble lies
D.what is the trouble
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