Catastrophe is the tragic element
"<span>The library's holdings increased from 4 million books last year to 4.2 million this year" is what I believe the answer is, as this is the only one that doesn't directly affect the entire community.</span>
It is simple first you choose your topic and then you can either have it ryme or not.
Triumphantly is an adverb, so you would be looking for the verb that it modifies. I would choose the word “pressing.” Ask yourself, “how did he press down the alarm knob?” He pressed it triumphantly.