Mei Li:
In 1852 American Elisha Graves Otis produced the first successful (eponymously branded) safety??
Shuai Zheng:
elevator
Mei Li:
Who played Mike Flaherty, the deputy mayor of New York, in the US television series 'Spin City'??
Shuai Zheng:
michael j fox
Mei Li:
In what year was the Berlin Wall erected??
Shuai Zheng:
1961