根据课文大意，在每个空格处填上一个合适的单词。

    Several days before July 28, 1976, many ____ things happened in Tangshan. They were signs for an ____. But people ____ lived there didn't think much of that. At 3:42 am that day, the earth began to shake, which ____ almost all the city in fifteen terrible seconds. Many people, including workers and doctors, came to ____ those who were ____ under the ruins. Later that afternoon, another big earthquake hit the city. More people were killed or ____ and more buildings ____ down. Very soon the army sent a lot of soldiers to help, and teams were ____ to dig out the trapped and to ____ the dead. By and by things improved and the city began to breathe again.