The american people must take action right now to deal with the problem of pollution that (looms, seethes) so large on our horizon.
Answer: looms
I saw white-bearded men rising and shaking their fists at the obdurate Professor. The whole great audieance seethed & simmered like a boiling pot. The Professor took a step forward and raised both his hands
If something seethed, then it was NOT
a. annoyed
b. upset
c. calm
d. unusual
Answer: c. calm