There are different 1of animals in the zoo. We can see the zoo keepers (饲养员) give them food to 2. They don't have to 3 food by themselves. They just eat, walk and sleep 4 day. So many of us think the animals in the zoo are 5 and lucky. But most of them are sad. Why? They are no longer free.

    Animals 6 elephants, monkeys and tigers usually live freely and happily 7 forests (森林) or mountains. Tigers, for 8, run, jump, play 9 their children and catch small animals for food. But now they have to stay in small cages in the zoo. Their life in the zoo is quite different from their life in the forests. Now many people think more animals should go 10 to forests and mountains so that they become free and happy again.

— Can your sister swim?  

— _______. But she can ride a bike. （  ）