Answer:
1)There are several steps that someone must take to become a doctor
2)First you must earn a bachelors degree
3)Then, you must get admitted into to medical school and earn a medical degree.
4)Next, you will need to complete a residency.
5) Finally, you will need to get a medical license, and become board certified in your specialty area.
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It's to separate 2 independent clauses.
The answer is:
Worked hard to take care of their patients.