NaF is not covalent, but ionic, as Na and F are on opposite sides of the periodic table.
If you are referring to "under the car" as a phrase, then it is an adverbial phrase that should show the place. If you are referring to "soccer" it functions as an adjective used to describe the central word of the cluster, that is, the ball.
d it is in the answer quite simple
1. Adversity means: a state or instance of serious or continued difficulty or misfortune, or showing courage in the face of adversity.
2. The word adversity relates to heroism because in both definitions there are something to do with bravery, and adventure. Also, there are courageous qualities in each word.
This book is 13 + which is basically grade level 8+
