阅读填空。首字母已给出。
Many people think that animals in the zoo are (1) h______ and lucky. But (2) m______ of them are sad.
Do you know why? Animals like tigers, (3) l______ and bears (4) u______ live in forests and (5) m______.
They can run, jump, play with their (6) c______ and catch small animals for food. But now they have to
(7) s______ in small rooms in the zoo. They don't have to (8) f______ food by themselves (9) b______ the
zoo keepers feed them. They do nothing but eat, walk and (10) s______ every day.