根据提示写出表示职业的单词或词组。 1. She cleans streets every day . She is a _______ . 2. Mr . Li drives a taxi every day . He is a _______ _______ . 3. I teach lessons . I am a _______ . 4. He sings songs on TV . He is a _______ . 5. He can play football very well . He is a _______ ________ .