Answer:
1. Es
2. Es
3. Está
4. Eres
5. Están
6. Son
Explanation:
1. Verb "Ser" (to be), conjugated in 3rd person singular "Él". Used to describe someone or something´s qualities. In english: Mr Montoya IS the Economics teacher
2. Verb "Ser" (to be), conjugated in 3rd person singular "Él". Used to describe where someone or something is from. In english: He IS from Salamanca
3. Verb "estar" (to be), conjugated in 3rd person singular "Eso". Used to describe someone or something´s location in space. In english: The coffee shop IS not next to the library.
4. Verb "ser" (to be), conjugated in 2nd person singular "Tú". Used to describe someone's or something's qualities. In english:You ARE Maria Elena´s roommate, right?
5. Verb "estar" (to be), conjugated in 3rd person plural "Ellos". Used to describe someone's or something's location. In english: Right now the kids ARE in class.
6. Verb "ser" (to be). conjugated in 3rd person plural. Used to tell the time. In english: It IS two thirty.