Read the following passage and fill in the blanks with proper words （在下列短文内填入恰当的词，使其内容通顺，每空格限填一词，首字母已给）

It is good to keep animals in zoos．Zoos are places for people to see many different kinds of animals from all over the world．W（71） zoos，most people would never see a real tiger or bear．Secondly，zoos look after the animals very c（72） ．The animals are always given food and cleaned on time．In the wild，it is not always possible for an animal to find food，so sometimes it gets h（73） ．Thirdly，zoos protect the animals．They offer them safe place to live in．In the wild，some kinds of animals are in danger．But zoos give these animals a chance to l（74） ．If there are no zoos，there would be fewer kinds of animals in the world．
However，some people think it is unnatural （非自然的） and unfair（不公平的） to keep wild（野生的） animals in cages．Most animals are kept in cages that are too small for them．The animals such as bears and tigers always look s（75） in cages．Wild animals should look for their own food．Anyone would not feel happy i（76） he isn't allowed （允许） to go outside his home and animals don't like it either．