There are difficult k____ of animals in the zoo.We see the zookeepers give them food to e_____.

There are different (kinds) of animals in the zoo.We see the zoo keepers give them food to 　　(eat).They don’t have to find food by (themselves).They just eat,walk and sleep (all) day.So many of us may think that the animals there are (happy) and lucky.But most of them are sad.Why?They’re no longer (free)!
Animals like elephants,monkeys and tigers usually live freely and happily in forests or mountains.Tigers,for (example) ,run,jump,play with their children and catch small animals for food.But now they have to stay in small rooms in the zoo.Their life in the zoo is quite (different) from their life in the forests.
Now many of us think more animals should go (back) to forests and mountains so that the earth will (become) better.