Unfortunately ,all the people were buried alive and the city was buried too.(同义句转换)
Unfortunately ,all the people were buried alive and_【so was】the city.
简析：这是练习【所叙述某种情况也适合于另一人或另一物的倒装句型】.
其倒装句型如下：So +be/助动词/情态动词+主语.
由于原句中用了【all the people were buried alive and the city was buried too】,那么,转化后的句子应该是：
Unfortunately ,all the people were buried alive and_【so was】the city..