[al:新概念英语（第1册）第115课（听力强化·中美）]
[ti:Knock, Knock!－敲敲门！]
[ar:© 2011 露珠英语工作室]
[by:http://weibo.com/DewEnglishStudio]
[00:00.00]There's none left.
[00:01.00]一点都不剩了。