What is the irony of a very old man with enormous wings?

The irony is that even as they see themselves as people of faith—as does the town priest—they are all blind to the fact that angel or not, the old man is God's creature.

a caption indicating the purpose of the diagram

explanation:

a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)