34.
Your Answer is
Correct Answer is H
Explanation
However "however", as the case maybe "depends on the situation", in fact "in fact", regardless of time "regardless of time", the previous sentence means "the air outside is very cold, and the students inside are alive and well, ignoring the classroom ", the last sentence means "they, in fact, are very disturbing" This sentence is to explain the situation of a fact, so use in fact.