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Use of prepositions in English: rules
Use of prepositions in English: rules

The use of prepositions as adverbs of place, adverb of time, subject, complement of a compound nominal predicate, complement of a simple or compound verbal predicate, complement of a noun, complement of a verb, particle of a phrasal verb and complement of an adjective. Rules. Examples. Table

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Relationships between organisms: types, forms and examples. Interactions between living organisms in an ecosystem
Relationships between organisms: types, forms and examples. Interactions between living organisms in an ecosystem

Relationships between organisms in nature are diverse. From cooperation to competition. But to understand the world around us is possible only after studying the largest types of relationships

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List and levels of Olympiads for schoolchildren
List and levels of Olympiads for schoolchildren

School Olympiads are a chance for any gifted and hardworking student to be a winner and enter one of the leading Russian universities without exams. What levels of Olympiads exist, how they are held, what are the criteria for selecting participants - read about all this in the article