新概念英语题求解（摘要写作）

新概念英语题求解（摘要写作）
原文：
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!
how long were detectives waiting at the airport
what were they expecting from south africa?
where did two men take parcel after the arrival of the plane
how many detectives opened it
what was the parcel full of?
求解释句子意思（别来度娘翻译）最好有写作答案