阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。 Many people may think that animals in the zoo are happy, free and {#blank#}1{#/blank#} (luck), but most of them are sad. Do you {#blank#}2{#/blank#} (know) why? Animals {#blank#}3{#/blank#} tigers, lions, and bears usually {#blank#}4{#/blank#} (live) in forests or mountains. They run, jump, play with their {#blank#}5{#/blank#} (child) and catch small animals for food. But now they have to {#blank#}6{#/blank#} (stay) in cages, small rooms in the zoo. They don't have to find food by {#blank#}7{#/blank#} (they) because the zoo keepers feed them. They do nothing but eat, walk {#blank#}8{#/blank#} sleep every day. Their life in the zoo {#blank#}9{#/blank#} (be) quite different from that in the forest because they are not free. Maybe they miss their mothers and their friends. {#blank#}10{#/blank#} fact, they feel lonely.
