---You’recoughingbadly,Martin．Whynotgiveupsmoking?---Giveupsmoking?Easier

---You’re coughing badly, Martin．Why not give up smoking?---Give up smoking?Easier said than done, Amy．Once you ________ the habit of smoking, it is very hard for you to ________ ．A.keep up; break it awayB.take up; drop it outC.pick up; get rid of itD.build up; do away with it

C解析pick up的本义是“捡起”，用在此处可表示“形成”；get rid of有“除去”之意。

谢谢了