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All meaning everything, takes a singular verb, all meaning everybody, takes a plural verb: All of us are present.
(A dozen = 12): I'd like to buy a dozen eggs. When dozen isn't preceded by a numeral (like three) or by a we use the plural form: There were dozens of eggs
Names of languages are singular and always take a singular verb.
When we use hair to denote a single thread, the plural form is hairs: I found two long hairs in my food.