问题补充：
–Smoking is bad for your health. --Yes, I know. But I can’t .
A. give it in
B. give it up
C. give it out
D. give it away
答案：
A. give it in
(答案→)B. give it up
C. give it out
D. give it away
解析：考查give的短语辨析。A屈服，让步；B放弃；C发出，筋疲力尽；D赠送，泄漏，出卖；句意：—吸烟有害健康。—是的。我知道，可是我就是戒不掉。根据句意说明本句使用的是放弃；故B正确。
