In Tyson's opinion, what is the greatest achievement of human flight?

According to Neil Degrease Tyson in his text "To Fly" the biggest achievement of human flight is the voyager 2.

Explanation:

The reasons behind this are that Tyson explains very well that not the first airplane, helicopter, or space rocket were the biggest achievements. But the voyager because it allowed the human race to understand the universe in a way we always wanted to do but we couldn't. Considering the voyager 2 is a robotic spacecraft equipped with incredibly precise machines that allow us to discover outer systems, planets, bodies, and phenomenons. As beams, radiation, sounds, and exo-planets.

answer: this is easy, i found "it"

i will repeat the question again, "find it."

here, i located it.

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.)