My neighbor's puppy ____ bark at me every time ,but now it's friendly. Clara ____ like cobras,but yesterday, she adopted one as a pet. The zoo ____ to have polar bears. I ____ believe that camels drink very little water. African elephants ____ have more population before the big threat. Kangaroos in the wild ____ interact with humans. Hippos ____ travel across a much large grade. Monkeys ____ steal things from others. Peacocks didn't ____ have vibrant plumage when they were young. The giraffes ____ travel this part of the savanna,but now they have herds.

Used to and didn't use to(animals).

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