OE



Frisson, precipitating. The protesters are getting what they want: the queen is suddenly abdicating (giving up) the throne. "Thrill” or “excitement” may work well for the first blank, and frisson fits. Murmur, while possible, doesn't capture the sense of excitement one would expect. A panegyric (formal speech or composition in praise of someone or something) is not something that would “run through the crowd,” certainly not in praise of the very queen the crowd wishes to depose. For the second blank, one might expect a period of disorder to begin following a political upheaval; precipitating is the only possibility. Marring (damaging, disfiguring) and diluting (making weaker by adding other elements to it) aren't really things that could be done to “a period” of time.