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
629.答案是D;考查介词短语在具体语境中的运用。In exchange与…交换；in return 作为对…的回报;in brief简而言之；in advance 提前，预先。
630.答案是D;此处from由于，因为，表示原因，beyond what I can imagine=beyond my imagination 无法想象。
