Animals in zoos ____________ humanely. ( must / treat ), Cats and dogs ______________ against certain diseases. ( have to / vaccinate ), After the injured bird recovers, it ________________ to the wild by staff from the animal hospital. ( can / return ), Animals _______________ to fight. ( must / not / force ), Important discoveries ________________ thanks to animal research. ( may / make ), Tigers ____________ as pets. ( should / not / keep ), Some people think horse racing _______________ by the government. ( should / prohibit ), Your wood floors _____________ if you get a large dog. ( might / damage ).

Unit 06. Passive modals

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