world - record, issue - a certificate, officially - recognised, throw - into doubt, clarify - an issue, unspoiled - environment, scientific - community, improve - my work, school - report, poor - performance, clear - picture, primary - school, secondary - education, discipline - problems, take - revenge, genetically - modified, genetic - structure, fight - disease, valuable - lesson, work - of art, river - bank, youth - club, do - research, food - chain, long-term - effects, fluent - speaker, share - experiences,

Practice Test 1_Collocations

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