A concrete statement can be considered as a 'solid' statement. This means that the sentence must contain hard facts to manifest the credibility of the statement. As much as possible, you give specific examples and provide evidence for this. From the choices, the answer would be D.
At evening it hath died away.
I would say this because the wind doesn't actually die.
I believe the answer is improve, i hope this helps
Tortoise did not give up as he slowly crawled to the finish line. Rabbit was nowhere to be seen. Maybe he already passed it, maybe he got lost?