To fly Space chronicles, what does the author present such a strong contrast between walking and flying

you need need more details so we can understand what your asking us.

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.)

the underlined phrase is an example of : understatment

i don’t know your in college god damit