S2 문장의 [______]에 들어갈 단어는?
난이도 필수 · 힌트를 덜 열수록 높은 점수 (현재 5점)
Nothing happens immediately, so in the beginning we can't see any results from our practice.
This is like the example of the man who tries to make fire by [______] two sticks of wood together.