根据所给句子选出相应的职业
teacher doctor farmer driver policeman
①I work in a hospital. I help people. I am a ____.
②I work on the farm. I get many good things in autumn. I am a ____.
③I drive a bus every day. I can travel. I am a ____.
④I work at school. I love my students. I am a ____.
⑤I am very busy. I catch the thieves(小偷).I am a____.