19 is preterite. 20 is imperfect. 21 is conditional.
Answer: D. Dentista
Explanation:
"Me duele un diente, tengo que ir al.." translates to "My tooth hurts, I have to go to the.."
A. Bombero = Firefighter
B. Policia = Police
C. Doctor = Doctor
D. Dentista = Dentist
If your tooth hurts, you would go to the dentist. This means the answer to your question is;
D. Dentista
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lo siento, homber, lo se, apesta
Espero que esto ayude.