Luckily for those planning a camping trip, there are a lot of shops online ___ camping equipment.
A. focusing on
B. specializing in
C. centering upon
D. dealing with
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He burst into tears, ___ his guilt before his horrified parents.
A. blurting on
B. breaking out
C. blowing out
D. carrying out
He had known all along, he had ___, and he had lied steadily.
A. made up
B. given up
C. covered up
D. set up
So the day wore ___ and still they sat, drinking, smoking and talking.
A. away
B. down
C. off
D. on
3.以下说法正确的是（）
A. 流失一个客户，可再开发一个客户进行弥补
B. 潜在客户无处不在，只要开发的好，不用太关注老客户
C. 吸引一个新客户的成本一般是保留一个老客户成本的6倍以上
D. 维护一个老客户的成本一般是开发一个新客户成本的6倍以上
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