用所给词的正确形式填空。
1.How many___________(firefighters, firefighter) are there?
2. My mother is a _______(writer/write).
3. What_________(do/does) your cousin do?___________(His/He's) a cook.
4. My father is a ________(doctor, teacher). He has a lot of students.
5. She’s my aunt. She’s a __________________(office worker, nurse).
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