Mei Li:
When was Vatican City, the smallest independent sovereign state in the world, established??
Shuai Zheng:
1929
Mei Li:
How is the chemical compound Polyvinyl Chloride better known??
Shuai Zheng:
pvc
Mei Li:
Which American folk singer wrote 'This Land is Your Land'??
Shuai Zheng:
woody guthrie