Active modals.: Because they cannot fly, penguins must live in areas where food is plentiful., Penguins can stay alive in colder weather longer than any other animal on Earth., Dolphins may learn and understand complex commands., Octopuses may change color and texture to camouflage themselves., Monkeys will groom each other as a form of social bonding., Passive modals. : Birds of prey can be found on every continent except Antarctica., Elephants in captivity should be given pedicures to keep their feet healthy, The injured bird may be taken to a wildlife rehabilitation center for treatment., Visitors should be accompanied by a guide, The new policy will be implemented next month,

Active vs. Passive modals.

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恢复自动保存：？