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At school, his (1) r_s_ _ _s were always the best. He also got many (2) a_ _ r_s for participation in science contests. Then he managed to get into a prestigious university. Inspired by one of his(3) l _ c_ _ _ _ rs, he got deeply involved in protecting the Earth and chose (4) e_ _ i_ _ _m_ _ _ _ _ science as his main course. At the moment, he is studying for a (5) _ e _ _ e _ in this field.