'Again' in the Bible

All the streams flow to the sea,yet the sea is never full.The streams are flowing to the place,and they flow there again.

Again, I observed all the acts of oppression being done under the sun. Look at the tears of those who are oppressed; they have no one to comfort them. Power is with those who oppress them; they have no one to comfort them.

Again, I saw futility under the sun:

As he came from his mother’s womb, so he will go again, naked as he came; he will take nothing for his efforts that he can carry in his hands.

Again I saw under the sun that the race is not to the swift, or the battle to the strong, or bread to the wise, or riches to the discerning, or favor to the skillful; rather, time and chance happen to all of them.