Since the time of the Aztecs did (organize) the so-called tianguis? Gael Garcia Bernal (acting) in soap operas before becoming a movie star? Frida Kahlo (express) in her portraits the pain of her personal life? When the Spaniards arrived in the new world and (existing) other highly developed cultures (developed)? The Aztec, Inca and Mayan civilizations not (be) the only ones of the pre-Columbian era? the Olmec religion (consider) the jaguar as god of agriculture, land and rain?

Since the time of the Aztecs did (organize) the so-called tianguis?

Yes, these markets were not very  far from the religious temples of the Aztecs where there are even reports of celebrations. For example the celebration dedicated to Toci,  in which the future victim came to sell in the  square the last tissues before being decapitated . The market was a place of worship, a sacred place where commerce and religion were linked.

Gael Garcia Bernal (acting) in soap operas before becoming a movie star?

yes, He participated in the soap operas "cuna de lobos" and "el abuelo y yo"

Frida Kahlo (express) in her portraits the pain of her personal life?

Yes, this Mexican painter expressed in her paintings her physical and emotional pains. for example, her back´s pain, the amputation of her toes and the loss of her baby.

When the Spaniards arrived in the new world and (existing) other highly developed cultures (developed)?

When the Spaniards came to invade, in the continent civilizations developed with great astronomical, mathematical, geographical and cultivation techniques among others. For example the Aztecs, Mayans and Incas.

The Aztec, Inca and Mayan civilizations not (be) the only ones of the pre-Columbian era?

There are other pre-Columbian towns, for example, the Guarani, the Araucanians, the Muiscas and the Calima culture.

The Olmec religion (consider) the jaguar as god of agriculture, land and rain?

For the Olmecs the jaguar is synonymous with the land and is guardian of darkness, from where the jungle sprouts. it is the expression of the fertilizing water that fertilized the earth,

there is no "following"

answer:   i cant   remeber exactly but i just got out of spanish a few months ago and the dbas are really easy. just relax, and have your notes in front of you. they are going to ask you the basics study the notes you wrote and you will be fine, make sure to really study grammar and pronuciation. the spanish teachers are usually nice so if you mess up they will go easy on you. you got this, you did the lessons and tests just focus and dont overthink the process.