“Knuckle down” means to begin working seriously. Its likely origin in marbles helps explain the idea of focus and determined effort.
Zero Article with General Nouns Exercise
Title: Zero Article with General Nouns Exercise; CEFR level: A2; Focus: using no article before plural or uncountable nouns when speaking in general.
100 Best Synonyms for “Events”
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100 Best Synonyms for “Irresponsible”
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