1．Don't leave the lights on. It wastes electricity (电)．
2．Leaving home was a major event (事件) in his life.
3．This is one of the worst natural disasters (灾难) ever to hit the area.
4．Will the clothing give protection against extreme (极度的) cold?
5．The balloon suddenly burst (爆裂) when I was blowing it up.
6．Jack had to drop out of the race because his foot was seriously injured (受伤的) halfway.
7．The earthquake was so big that most of the houses in the small village were completely destroyed (破坏)．
8．In order to catch the bear, some villagers set a trap (陷阱) and covered it with some leaves.
9．After learning that the boys had been lost for almost 20 hours, the police sent out a rescue (营救) team to look for them.
10．After the woman heard that her husband was killed in the car accident, she went into shock (休克)．
