Suggested answers:
1. But the one million people of the city, who thought little of these events, went to bed as usual that night.
但是，唐山市的一百万居民当天晚上照常上床睡觉了，他们几乎都没有把这些情况当一回事。
2. It was heard in Beijing, which is one hundred kilometers away.
100千米以外的北京市都听到了地震声。
3. A huge crack that was eight kilometers long and thirty meters wide cut across houses, roads and canals.
一条8千米长30米宽的巨大裂缝横穿房舍、马路和渠道。
4. The number of people who were killed or injured reached more than 400 000.
死伤的人数达到40多万。
5. The army organized teams to dig out those who were trapped and to bury the dead.
救援人员组成小分队，将被困的人挖出来，将死者掩埋。
6. Workers built shelters for survivors whose homes had been destroyed.
救援人员为那些家园被毁的幸存者盖起了避难所。
→Step 3 Summary of the attributive clause
