1．She ________ (爆发) out laughing at the joke the moment she heard it.
答案：burst
2．The firemen ________ (援救) the boy from the burning house.
答案：rescued
3．They began to recover slowly from their nightmare of pain and ________ (苦难)．
答案：suffering
4．With so many people ________ (掩埋) under the mine, none of the rescue workers would stop to have a rest.
答案：buried
5．The ________ (足迹), which looked like a fox's, led into the woods.
答案：tracks
6．We were all s________ at the news of his death.
答案：shocked
7．The hurricane left the whole city in r________.
答案：ruins
