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 _______ ________ .