Many people may think that the ___ in the zoo are happy and lucky, but most ___ them are not happy. Do you know why? Animals ___ tigers, lions and bears usually ___ in forests or mountains. They run, jump, play ___ their children and catch small animals for ___. But now they have ___ stay in cages or small rooms in the zoo.They do not have to find food by themselves. Because the zoo keepers feed ___.They do nothing but eat, walk and sleep every day. Their life in the zoo is quite ___ from that in the forest ___ they are.not free.