L7,too late

words:

parcel，包裹

detective，侦探

expect，期待

airfield，飞机起落的场地

guard，警戒，守卫，n

precious，adj，珍贵的

stone，石头

 

expressions：

keep guard，守卫

to one's surprise，令某人吃惊

 

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.