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December is coldest month of the year in my country.
February is the most short month in the year.
Climbing is the most dangerous sport than skiing.​

Ответ:

is the coldest

is shorter

is more dangerous

December is the coldest month of the year in my country.

February is the shortest month in the year.

Climbing is the most dangerous sport than skiing.​  

coldest - Missing article

is the most short - Grammar mistake

is more dangerous - Grammar mistake