He enjoyed the sensation of freefall while skydiving.

He is living freely.

He can play the piano freely.

He is good at writing free verse.

As the saying goes, 'spare the rod and spoil the child', if you pamper them, children will not grow.

He is always grumbling about trivial things, it's really annoying.

There are no words to describe that beauty.

Astrobiology is a very interesting field of study.

He is majoring in aerospace engineering.

Cosmic background radiation is considered evidence of the Big Bang.