请将正确的词(组)写在横线上。
bus driver farmer doctor teacher worker
1. My grandfather works on a farm. He is a
________.
2. Mrs. Smith drives a bus every day. She is a
________.
3. John works at a hospital. He is a
________.
4. My uncle works in a company (公司). He is a
________.
5. Carol teaches students at a school. She is a
________.
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