这是今年最严重的寒潮，气温降到了零下20度。

This is the ___severest cold wave of the year, with temperatures dropping to -20°C.

学校对作弊行为采取了最严厉的处罚措施。

The school imposed the ___severest punishment for cheating.

这次风暴带来了本季度最严重的破坏。

The storm caused the ___severest damage of the season.