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Large animals, like tigers and bears, need to be trained ________ they are still very young.
when
Though large, trained elephants are obedient. They will usually go ________ they are led.
wherever
________ someone has an unusual pet, serious problems can arise.
Whenever
________ you see a cat flatten its ears, you should assume it's upset.
Whenever
________ my sister and her family live now, tenants aren't allowed to have pets.
Where
________ a messenger pigeon is taken somewhere and released, it almost always finds its way home.
Whenever
