https://online2.tingclass.net/lesson/shi0529/0009/9907/341.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
hang up 掛電話
Always say goodbye before you hang up the phone.
別忘了在掛斷電話之前要與對方說再見。
hang on 稍等片刻，別掛電話
Mike will be back at once, hang on.
Mike馬上就回來，別掛斷電話。
瘋狂練習(xí)吧!
