Mei Li:
Which heavenly body was discovered by astronomer Clyde W Tombaugh on 18 February 1930??
Shuai Zheng:
pluto
Mei Li:
Before Bill Clinton, who was the last Democrat President of America??
Shuai Zheng:
jimmy carter
Mei Li:
On which river does the Grand Coulee Dam stand??
Shuai Zheng:
columbia