<span>To ask how much longer the professor will live is to ask how much longer we must wait for the blessings of another world war.
"blessings" being the key word, because a world war would not bring blessings, but devastation. </span>
The mood is unsettling and suspenseful. The words "unfamiliar, concerned, unusually, and heavy" help set the mood to this.
A is the answer one uses poles the other a study
intents and
In this sentence "intensive" is used incorrectly. Intensive means very concentrated or focused on a specific subject. The sentence should say "for all intents and purposes". This does repeat the idea of purposes because someone's intent is their purpose, but that is the correct phrase that is commonly used. It comes from 16th century English law and means "in every practical sense".