Перепишите следующие предложения,подчеркните в каждом из них модальный глагол или его эквивалент. 1.a daily ration of any animal should contain vitamins,proteins and minerals. 2.well-managed egg farms must achieve very high outputs. 3.one should not keep the batteries uncharged. 4.the repair technician was able to start an engine yesterday.

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