Final answer:
The subject is Spanish and the correct completion of the sentence is 'en ayunas', meaning 'on an empty stomach'
Step-by-step explanation:
The subject of this question is Spanish and it is at a High School level.
The correct answer to complete the sentence is en ayunas, which means 'on an empty stomach'.
So the complete sentence would be: 'This morning I don't have breakfast; I have to go to the doctor on an empty stomach and I can't eat.'
Learn more about Spanish vocabulary