It's avail, avail means make use of
10. a prayer that her love will live eternally
Saying that she hopes God allows that her love will live on after death shows that she wants a love that lives forever
11. c. "Landscape plotted and pieced--fold, fallow and plough"
This shows what he has done to his land to make it his own and how hard he has worked on it
12. d. "The land's sharp features seemed to be/the Century's corpse outleant"
This shows that the land basically resembles a corpse which shows how powerful an effect nature can have on shaping land.
1. The truck tumbled down the street rapidly.
2. The man drudged home from a day of work sadly.
It said I could add my own choice of adjectives or adverbs after the sentences and so, I did just that. I hope this helps!