1．Eleven kilometres directly below the city, one of the most deadly earthquakes of the 20th century had begun, a quake that/which even caused damage more than 150 kilometres away in Beijing.
2．The number of people who/that were killed or badly injured in the quake was more than 400，000.
3．Soon after the quakes, the army sent 150，000 soldiers to Tangshan to dig out those who were trapped and to bury the dead.
4．Workers built shelters for survivors whose homes had been destroyed.
5．The man (whom/who/that) I have to phone lives in Canada.
[我的发现]
(1)关系代词who指人，在定语从句中作主语、表语或宾语，如句2、句3和句5。
(2)关系代词whom指人，在定语从句中作宾语，在口语和非正式文体中可用who或that替换，如句5。
(3)关系代词which指物，在定语从句中作主语或宾语，如句1。
(4)关系代词that既可以指人也可以指物，在定语从句中作主语、宾语、表语，如句1、句2和句5。
(5)关系代词whose既可以指人也可以指物，在定语从句中作定语，如句4。
