练习材料：
Lesson 7 Too late
The plane was late and detectives were waiting at the airport all morning. They were expecting a valuable parcel of diamonds from South Africa. A few hours earlier, someone had told the police that thieves would try to steal the diamonds. When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on the airfield. Two men took the parcel off the plane and carried it into the Customs House. While two detectives were keeping guard at the door, two others opened the parcel. To their surprise, the precious parcel was full of stones and sand!
笔记：thieves /θiːvz/总是咬舌不到位，觉得这个单词在句子时好难读。
感悟：这一课断句没把握好，有些句子比较长，换气缓不过来，练习好多遍还是卡壳。
