问题补充：
People attracted onto Facebook with the promise of fun, free service don’t realize they’re paying for it by their personal information.
A. giving in
B. giving off
C. giving up
D. giving away
答案：
A. giving in
B. giving off
C. giving up
(答案→)D. giving away
解析： A. give in：让步、屈服； B. give off：释放（气体等）； C. give up：放弃； D. give away：泄露。题意：许多人为face book吸引，但意识不到个人信息的泄露。故D项正确。
