Irony is the opposite of what you expect. For example, you would not expect the teacher’s daughter to dropout of high school. That would be ironic. Why is it ironic (not expected) that the author describes Sam McGee as “…cool and calm…” at the end of the poem?

They might have not been cool and calm, you didn't add the story

i'm not good at running

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.)