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629.Shall we visit Jim tonight?
OK.To make sure that he's in,we'd better call him up _______.
A.in exchange
B.in return
C.in brief
D.in advance
630.Susan's head ached _____ staring at the screen for over ten hours.
Over ten hours!That's really _____ what I can imagine!
A.of;above
B.in;over
C.through;among
D.from;beyond
