life is competitive, (-) when we talk about plural and uncountable nouns in general, if you lose a race, (a) when something is one of many, when I was at school, (-) in some phrases after a preposition (in, on, at), more competition is the answer, (the) when it's the only one of something (or the only one in a place), sport days in a public park, (a) when we mention something for the first time, everyone in the park, (the) when we have talked about the things before

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