Употребите нужную степень прилагательного. winter is (cold) season of the year. moscow is (large) than st.petersburg. your son worked (well) of all. today you worked (slowly) than usually. who knows him (well) than you? the baltic sea is not so (warm) as the black sea.

Winter is the coldest season of the year.
Moscow is larger than St.Petersburg.
Your son worked best of all.
Today you worked slower than usually.
Who knows him better than you?
The Baltic Sea is not so warm as the Black sea.