Space
To ESCALATE something means to make it worse. So, to have ESCALATED the argument means to have made the argument worse.
skip
a) estimated Clues --- wasn't sure exactly, thought, around
skate
To resemble means to "be, look, or act alike". Some synonyms for this use of the word would be "looks like" or "is like".
spider
c) mild Clues -- added more garlic
Smell
WITHDRAW means to remove, take away or take back.
speak
b) died Clues -- killing, people, population
stick
Some synonyms for IMMENSE would be, "big, large, massive, huge, overwhelming, enormous".
smile
a) powerful Clues -- not stop thinking about it
snake
SENSELESS means without meaning; meaningless. To have no purpose.
spoil
b) many Clues -- reasons why