朗读句子，填空，使句子通顺、完整。

1．My mother sells things．She is a ________．

2．My father helps sick people．He's a ________．

3．My brother teaches math．He's a ________　________．

4．My aunt cleans streets．She's a ________．

5．My sister draws pictures．She's an ________．

6．Mr Black works on a farm．He's a ________．

7．Mr Smith works in a police station．He's a ________．