After Uncle Marcos returns from his flight in the bird, what business does
he set up with Clara?

Uncle Marcos and Clara became fortune tellers.

Explanation:

After the flight, he set up a fortune-telling business with Clara, which was very successful because people really liked their predictions. However, they left it because they realized their lectures could actually affect their clients and they decided to stop doing it because they were frightened. That way nothing bad would happen to them. The way the Blitz helped to unify Britain during world war II was:

: b : o   : 0 ; b : - )  

: b: b: b: b: b: b: b: b: b

i would say the correct answer is not concrete.