The plane was late and detectives were waiting at the airport all morning. They were expecting a valuable parcel od 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.

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guard[gɑ:d]警戒,守卫 airfield/飞机起落的场地

***过去进行时

when i was watering the garden, it began to rain./I was having breakfast when the telephone rang./While we were having a party, the lights went out/熄灭.George was reading whild his wife was listening to the radio./As i was getting on the bus, I slipped and hurt my foot./Someone knocked at the door just as i was getting into the bath./The plane was late and detectives were waiting at the airport all morning

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come and look at my photograph album./i am looking for my pen, I lost it this morning. Will you look after the children for me please?

he took off his coat/ He took his coat off. /He took it off.

He put out the fire./He put the fire out ./He put it out.

She put on her hat/She put her hat on. /She put it on.

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1.The detectives were at the airport to prevent a robbery.

2.The detectives didn't prevent the robbery.

3.Where were detectives waiting ? At the airport.

4.What were they expecting? A valuable parcel of diamonds.

5.Someone had told the police that thieves would try to steal the diamonds. This happened before the plane arrived.

6.The detectives went into the building and waited inside.

7.Two men took the parcel off the plane. They took it off.

8.The detectives were expecting a valuable parcel of diamonds.

9.The parcel was valuable. It was precious.

10.The thieves wanted to steal the diamonds.

11.The detectives waited inside the main building. This was the most important building.

12.Someone had filled the parcel with stone and sand. It was full of stones and sand.