'Efforts' in the Bible

What does a man gain for all his effortsthat he labors at under the sun?

For what does a man get with all his work and all his efforts that he labors at under the sun?

It is also the gift of God whenever anyone eats, drinks, and enjoys all his efforts.

Two are better than one because they have a good reward for their efforts.

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.