I wonder...
A: Who is the smartest student in the class?
B: I think it's Jihoon. / A: I wonder how smart he is. / B: The teacher says Jihoon got 100% on all his tests.
A: Who is the oldest person in the world?
B: I think it's Ethel Caterham. / A: I wonder how old she is. / B: This article says Ethel Caterham is 116 years old.
A: Which country is the smallest in the world?
B: I think it's Vatican City. / A: I wonder how small it is. / B: This book says Vatican City is 0.44km².