海南省是我国唯一完全位于热带的省级行政区．（判断对错）．

大自然的清洁工是____。 

    Many people like animals. So they keep(饲养) 1 as pets. Usually people like to keep dogs, cats, fishes and 2 animals as their pets. Many young people keep animals 3 they think these animals are 4. Some old people keep pets because 5children don't live 6 them and they 7 lonely (孤独的).

    Mr. Li is an old man. He is a pet doctor (医生). He is friendly to all people and their pets. People in the neighborhood love 8 very much. People usually call him "The Pet Doctor". When people's pets are sick(生病的), they often ask Mr. Li for 9. Mr. Li can always help the sick pets get well soon. So he is 10 popular in the neighborhood.